diff --git a/config.md b/config.md
index f0adcb44e..c2569be1c 100644
--- a/config.md
+++ b/config.md
@@ -137,14 +137,20 @@ For Linux-based systems the user structure has the following fields:
 
 ## Platform-specific configuration
 
+The *platforms* array should contain a list of platforms which the container supports. Only the main configuration file `config.json` may contain a *platforms* section.
+
 * **os** (string, required) specifies the operating system family this image must run on. Values for os must be in the list specified by the Go Language document for [`$GOOS`](https://golang.org/doc/install/source#environment).
 * **arch** (string, required) specifies the instruction set for which the binaries in the image have been compiled. Values for arch must be in the list specified by the Go Language document for [`$GOARCH`](https://golang.org/doc/install/source#environment).
+* **config** (string, optional) specifies the config file containing platform-specific overrides and/or platform-specific sections. File path must be relative to the main config (`config.json`) file.
 
 ```json
-"platform": {
-    "os": "linux",
-    "arch": "amd64"
-}
+"platforms": [
+    {
+        "os": "linux",
+        "arch": "amd64",
+        "config": "linux64.json"
+    }
+]
 ```
 
-Interpretation of the platform section of the JSON file is used to find which platform-specific sections may be available in the document. For example, if `os` is set to `linux`, then a JSON object conforming to the [Linux-specific schema](config-linux.md) SHOULD be found at the key `linux` in the `config.json`.
+In this case a JSON object conforming to the [Linux-specific schema](config-linux.md) SHOULD be found at the key `linux` in the `linux64.json` config file.
diff --git a/spec.go b/spec.go
index 45317ff86..a713b5d84 100644
--- a/spec.go
+++ b/spec.go
@@ -5,8 +5,8 @@ package specs
 type Spec struct {
 	// Version is the version of the specification that is supported.
 	Version string `json:"version"`
-	// Platform is the host information for OS and Arch.
-	Platform Platform `json:"platform"`
+	// Platforms supported by the container.
+	Platform []Platform `json:"platforms"`
 	// Process is the container's main process.
 	Process Process `json:"process"`
 	// Root is the root information for the container's filesystem.
@@ -53,11 +53,12 @@ type Root struct {
 	Readonly bool `json:"readonly"`
 }
 
-// Platform specifies OS and arch information for the host system that the container
-// is created for.
+// Platform specifies OS and arch information for the target host system.
 type Platform struct {
 	// OS is the operating system.
 	OS string `json:"os"`
 	// Arch is the architecture
 	Arch string `json:"arch"`
+	// Configuration file containing platform-specific configurations.
+	Config string `json:"config"`
 }