diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/appplatform.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/appplatform.json
index b4c55f95ca59..6a0cd41ee4e0 100644
--- a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/appplatform.json
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/appplatform.json
@@ -2034,6 +2034,9 @@
         "x-ms-examples": {
           "Deployments_Get": {
             "$ref": "./examples/Deployments_Get.json"
+          },
+          "Deployments_Get_CustomContainer": {
+            "$ref": "./examples/Deployments_Get_CustomContainer.json"
           }
         }
       },
@@ -2105,6 +2108,9 @@
         "x-ms-examples": {
           "Deployments_CreateOrUpdate": {
             "$ref": "./examples/Deployments_CreateOrUpdate.json"
+          },
+          "Deployments_CreateOrUpdate_CustomContainer": {
+            "$ref": "./examples/Deployments_CreateOrUpdate_CustomContainer.json"
           }
         }
       },
@@ -2223,6 +2229,9 @@
         "x-ms-examples": {
           "Deployments_Update": {
             "$ref": "./examples/Deployments_Update.json"
+          },
+          "Deployments_Update_CustomContainer": {
+            "$ref": "./examples/Deployments_Update_CustomContainer.json"
           }
         }
       }
@@ -3897,7 +3906,8 @@
           "enum": [
             "Jar",
             "NetCoreZip",
-            "Source"
+            "Source",
+            "Container"
           ],
           "type": "string",
           "x-ms-enum": {
@@ -3916,6 +3926,58 @@
         "artifactSelector": {
           "description": "Selector for the artifact to be used for the deployment for multi-module projects. This should be\r\nthe relative path to the target module/project.",
           "type": "string"
+        },
+        "customContainer": {
+          "$ref": "#/definitions/CustomContainer",
+          "description": "Custom container payload"
+        }
+      }
+    },
+    "CustomContainer": {
+      "description": "Custom container payload",
+      "type": "object",
+      "properties": {
+        "server": {
+          "type": "string",
+          "description": "The name of the registry that contains the container image"
+        },
+        "containerImage": {
+          "type": "string",
+          "description": "Container image of the custom container. This should be in the form of <repository>:<tag> without the server name of the registry"
+        },
+        "command": {
+          "description": "Entrypoint array. Not executed within a shell. The docker image's ENTRYPOINT is used if this is not provided.",
+          "uniqueItems": false,
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "args": {
+          "description": "Arguments to the entrypoint. The docker image's CMD is used if this is not provided.",
+          "uniqueItems": false,
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "imageRegistryCredential": {
+          "$ref": "#/definitions/ImageRegistryCredential",
+          "description": "Credential of the image registry"
+        }
+      }
+    },
+    "ImageRegistryCredential": {
+      "description": "Credential of the image registry",
+      "type": "object",
+      "properties": {
+        "username": {
+          "type": "string",
+          "description": "The username of the image registry credential"
+        },
+        "password": {
+          "type": "string",
+          "description": "The password of the image registry credential"
         }
       }
     },
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_CreateOrUpdate_CustomContainer.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_CreateOrUpdate_CustomContainer.json
new file mode 100644
index 000000000000..dcfc365e5838
--- /dev/null
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_CreateOrUpdate_CustomContainer.json
@@ -0,0 +1,193 @@
+{
+  "parameters": {
+    "deploymentResource": {
+      "properties": {
+        "source": {
+          "type": "Container",
+          "customContainer": {
+            "server": "myacr.azurecr.io",
+            "containerImage": "myContainerImage:v1",
+            "command": [
+              "/bin/sh"
+            ],
+            "args": [
+              "-c",
+              "while true; do echo hello; sleep 10;done"
+            ],
+            "imageRegistryCredential": {
+              "username": "myUsername",
+              "password": "myPassword"
+            }
+          }
+        },
+        "deploymentSettings": {
+          "resourceRequests": {
+            "cpu": "1000m",
+            "memory": "3Gi"
+          },
+          "environmentVariables": {
+            "env": "test"
+          }
+        },
+        "instances": null
+      }
+    },
+    "sku": {
+      "name": "S0",
+      "tier": "Standard",
+      "capacity": 1
+    },
+    "api-version": "2021-06-01-preview",
+    "subscriptionId": "00000000-0000-0000-0000-000000000000",
+    "resourceGroupName": "myResourceGroup",
+    "serviceName": "myservice",
+    "appName": "myapp",
+    "deploymentName": "mydeployment"
+  },
+  "responses": {
+    "201": {
+      "body": {
+        "properties": {
+          "source": {
+            "type": "Container",
+            "customContainer": {
+              "server": "myacr.azurecr.io",
+              "containerImage": "myContainerImage:v1",
+              "imageRegistryCredential": {
+                "username": "myUsername",
+                "password": ""
+              }
+            }
+          },
+          "appName": "myapp",
+          "deploymentSettings": {
+            "cpu": 1,
+            "memoryInGB": 3,
+            "resourceRequests": {
+              "cpu": "1000m",
+              "memory": "3Gi"
+            },
+            "environmentVariables": {
+              "env": "test"
+            }
+          },
+          "provisioningState": "Creating",
+          "status": "Running",
+          "active": false,
+          "instances": [
+            {
+              "name": "instance1",
+              "status": "Running",
+              "discoveryStatus": "N/A",
+              "startTime": "2020-08-26T01:55:02Z"
+            }
+          ]
+        },
+        "sku": {
+          "name": "S0",
+          "tier": "Standard",
+          "capacity": 1
+        },
+        "type": "Microsoft.AppPlatform/Spring/apps/deployments",
+        "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroup/providers/Microsoft.AppPlatform/Spring/myservice/apps/myapp/deployments/mydeployment",
+        "name": "mydeployment"
+      }
+    },
+    "200": {
+      "body": {
+        "properties": {
+          "source": {
+            "type": "Container",
+            "customContainer": {
+              "server": "myacr.azurecr.io",
+              "containerImage": "myContainerImage:v1",
+              "imageRegistryCredential": {
+                "username": "myUsername",
+                "password": ""
+              }
+            }
+          },
+          "appName": "myapp",
+          "deploymentSettings": {
+            "cpu": 1,
+            "memoryInGB": 3,
+            "resourceRequests": {
+              "cpu": "1000m",
+              "memory": "3Gi"
+            },
+            "environmentVariables": {
+              "env": "test"
+            }
+          },
+          "provisioningState": "Succeeded",
+          "status": "Running",
+          "active": false,
+          "instances": [
+            {
+              "name": "instance1",
+              "status": "Running",
+              "discoveryStatus": "N/A",
+              "startTime": "2020-08-26T01:55:02Z"
+            }
+          ]
+        },
+        "sku": {
+          "name": "S0",
+          "tier": "Standard",
+          "capacity": 1
+        },
+        "type": "Microsoft.AppPlatform/Spring/apps/deployments",
+        "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroup/providers/Microsoft.AppPlatform/Spring/myservice/apps/myapp/deployments/mydeployment",
+        "name": "mydeployment"
+      }
+    },
+    "202": {
+      "body": {
+        "properties": {
+          "source": {
+            "type": "Source",
+            "customContainer": {
+              "server": "myacr.azurecr.io",
+              "containerImage": "myContainerImage:v1",
+              "imageRegistryCredential": {
+                "username": "myUsername",
+                "password": ""
+              }
+            }
+          },
+          "appName": "myapp",
+          "deploymentSettings": {
+            "cpu": 1,
+            "memoryInGB": 3,
+            "resourceRequests": {
+              "cpu": "1000m",
+              "memory": "3Gi"
+            },
+            "environmentVariables": {
+              "env": "test"
+            }
+          },
+          "provisioningState": "Updating",
+          "status": "Running",
+          "active": false,
+          "instances": [
+            {
+              "name": "instance1",
+              "status": "Running",
+              "discoveryStatus": "N/A",
+              "startTime": "2020-08-26T01:55:02Z"
+            }
+          ]
+        },
+        "sku": {
+          "name": "S0",
+          "tier": "Standard",
+          "capacity": 1
+        },
+        "type": "Microsoft.AppPlatform/Spring/apps/deployments",
+        "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroup/providers/Microsoft.AppPlatform/Spring/myservice/apps/myapp/deployments/mydeployment",
+        "name": "mydeployment"
+      }
+    }
+  }
+}
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_Get_CustomContainer.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_Get_CustomContainer.json
new file mode 100644
index 000000000000..a58ecd0bee69
--- /dev/null
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_Get_CustomContainer.json
@@ -0,0 +1,67 @@
+{
+  "parameters": {
+    "api-version": "2021-06-01-preview",
+    "subscriptionId": "00000000-0000-0000-0000-000000000000",
+    "resourceGroupName": "myResourceGroup",
+    "serviceName": "myservice",
+    "appName": "myapp",
+    "deploymentName": "mydeployment"
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "properties": {
+          "source": {
+            "type": "Container",
+            "customContainer": {
+              "server": "myacr.azurecr.io",
+              "containerImage": "myContainerImage:v1",
+              "command": [
+                "/bin/sh"
+              ],
+              "args": [
+                "-c",
+                "while true; do echo hello; sleep 10;done"
+              ],
+              "imageRegistryCredential": {
+                "username": "myUsername",
+                "password": ""
+              }
+            }
+          },
+          "appName": "myapp",
+          "deploymentSettings": {
+            "cpu": 1,
+            "memoryInGB": 3,
+            "resourceRequests": {
+              "cpu": "1000m",
+              "memory": "3Gi"
+            },
+            "environmentVariables": {
+              "env": "test"
+            }
+          },
+          "provisioningState": "Succeeded",
+          "status": "Running",
+          "active": false,
+          "instances": [
+            {
+              "name": "instance1",
+              "status": "Running",
+              "discoveryStatus": "N/A",
+              "startTime": "2020-08-26T01:55:02Z"
+            }
+          ]
+        },
+        "sku": {
+          "name": "S0",
+          "tier": "Standard",
+          "capacity": 1
+        },
+        "type": "Microsoft.AppPlatform/Spring/apps/deployments",
+        "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroup/providers/Microsoft.AppPlatform/Spring/myservice/apps/myapp/deployments/mydeployment",
+        "name": "mydeployment"
+      }
+    }
+  }
+}
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_Update_CustomContainer.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_Update_CustomContainer.json
new file mode 100644
index 000000000000..55f438aa3506
--- /dev/null
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2021-06-01-preview/examples/Deployments_Update_CustomContainer.json
@@ -0,0 +1,131 @@
+{
+  "parameters": {
+    "deploymentResource": {
+      "properties": {
+        "source": {
+          "type": "Container",
+          "customContainer": {
+            "server": "mynewacr.azurecr.io",
+            "containerImage": "myNewContainerImage:v1",
+            "command": [
+              "/bin/sh"
+            ],
+            "args": [
+              "-c",
+              "while true; do echo hello; sleep 10;done"
+            ],
+            "imageRegistryCredential": {
+              "username": "myNewUsername",
+              "password": "<myNewPassword>"
+            }
+          }
+        },
+        "instances": null
+      }
+    },
+    "api-version": "2021-06-01-preview",
+    "subscriptionId": "00000000-0000-0000-0000-000000000000",
+    "resourceGroupName": "myResourceGroup",
+    "serviceName": "myservice",
+    "appName": "myapp",
+    "deploymentName": "mydeployment"
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "properties": {
+          "source": {
+            "type": "Container",
+            "customContainer": {
+              "server": "mynewacr.azurecr.io",
+              "containerImage": "myNewContainerImage:v1",
+              "imageRegistryCredential": {
+                "username": "myNewUsername",
+                "password": ""
+              }
+            }
+          },
+          "appName": "myapp",
+          "deploymentSettings": {
+            "cpu": 1,
+            "memoryInGB": 3,
+            "resourceRequests": {
+              "cpu": "1000m",
+              "memory": "3Gi"
+            },
+            "environmentVariables": {
+              "env": "test"
+            }
+          },
+          "provisioningState": "Succeeded",
+          "status": "Running",
+          "active": false,
+          "instances": [
+            {
+              "name": "instance1",
+              "status": "Running",
+              "discoveryStatus": "N/A",
+              "startTime": "2020-08-26T01:55:02Z"
+            }
+          ]
+        },
+        "sku": {
+          "name": "S0",
+          "tier": "Standard",
+          "capacity": 1
+        },
+        "type": "Microsoft.AppPlatform/Spring/apps/deployments",
+        "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroup/providers/Microsoft.AppPlatform/Spring/myservice/apps/myapp/deployments/mydeployment",
+        "name": "mydeployment"
+      }
+    },
+    "202": {
+      "body": {
+        "properties": {
+          "source": {
+            "type": "Container",
+            "customContainer": {
+              "server": "mynewacr.azurecr.io",
+              "containerImage": "myNewContainerImage:v1",
+              "imageRegistryCredential": {
+                "username": "myNewUsername",
+                "password": ""
+              }
+            }
+          },
+          "appName": "myapp",
+          "deploymentSettings": {
+            "cpu": 1,
+            "memoryInGB": 3,
+            "resourceRequests": {
+              "cpu": "1000m",
+              "memory": "3Gi"
+            },
+            "environmentVariables": {
+              "env": "test"
+            }
+          },
+          "provisioningState": "Updating",
+          "status": "Running",
+          "active": false,
+          "instances": [
+            {
+              "name": "instance1",
+              "status": "Running",
+              "discoveryStatus": "N/A",
+              "startTime": "2020-08-26T01:55:02Z"
+            }
+          ]
+        },
+        "sku": {
+          "name": "S0",
+          "tier": "Standard",
+          "capacity": 1
+        },
+        "type": "Microsoft.AppPlatform/Spring/apps/deployments",
+        "id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroup/providers/Microsoft.AppPlatform/Spring/myservice/apps/myapp/deployments/mydeployment",
+        "name": "mydeployment"
+      }
+    }
+  }
+}