diff --git a/docs/Configuration.md b/docs/Configuration.md
index d5bfaa77b..4f48f5dca 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -1,2 +1,4 @@
 # Configuration
-This documentation moved to a new place: [sap.github.io/ui5-tooling/pages/Configuration/](https://sap.github.io/ui5-tooling/pages/Configuration/)
+This documentation moved to a new place: [sap.github.io/ui5-tooling/pages/Configuration/](https://sap.github.io/ui5-tooling/pages/Configuration/).
+
+The **Specification Version Documentation** can be found here: [sap.github.io/ui5-tooling/pages/Configuration/#specification-versions](https://sap.github.io/ui5-tooling/pages/Configuration/#specification-versions)
diff --git a/lib/projectPreprocessor.js b/lib/projectPreprocessor.js
index 3d1813857..82625e979 100644
--- a/lib/projectPreprocessor.js
+++ b/lib/projectPreprocessor.js
@@ -272,11 +272,11 @@ class ProjectPreprocessor {
 			return false; // ignore this project
 		}
 
-		if (project.specVersion !== "0.1" && project.specVersion !== "1.0") {
+		if (project.specVersion !== "0.1" && project.specVersion !== "1.0" && project.specVersion !== "1.1") {
 			throw new Error(
 				`Unsupported specification version ${project.specVersion} defined for project ` +
-				`${project.id}. ` +
-				`See https://github.com/SAP/ui5-project/blob/master/docs/Configuration.md#specification-versions`);
+				`${project.id}. Your UI5 CLI installation might be outdated. ` +
+				`For details see https://sap.github.io/ui5-tooling/pages/Configuration/#specification-versions`);
 		}
 
 		if (!project.type) {
@@ -330,11 +330,13 @@ class ProjectPreprocessor {
 
 		if (!extension.specVersion) {
 			throw new Error(`No specification version defined for extension ${extension.metadata.name}`);
-		} else if (extension.specVersion !== "0.1" && extension.specVersion !== "1.0") {
+		} else if (extension.specVersion !== "0.1" &&
+				extension.specVersion !== "1.0" &&
+				extension.specVersion !== "1.1") {
 			throw new Error(
 				`Unsupported specification version ${extension.specVersion} defined for extension ` +
-				`${extension.metadata.name}. ` +
-				`See https://github.com/SAP/ui5-project/blob/master/docs/Configuration.md#specification-versions`);
+				`${extension.metadata.name}. Your UI5 CLI installation might be outdated. ` +
+				`For details see https://sap.github.io/ui5-tooling/pages/Configuration/#specification-versions`);
 		} else if (this.appliedExtensions[extension.metadata.name]) {
 			log.verbose(`Extension with the name ${extension.metadata.name} has already been applied. ` +
 				"This might have been done during dependency lookahead.");
diff --git a/test/lib/extensions.js b/test/lib/extensions.js
index c3a33fb92..7138cbd45 100644
--- a/test/lib/extensions.js
+++ b/test/lib/extensions.js
@@ -696,7 +696,8 @@ test("specVersion: Extension with invalid version", async (t) => {
 	const preprocessor = new Preprocessor();
 	await t.throwsAsync(preprocessor.applyExtension(extension),
 		"Unsupported specification version 0.9 defined for extension shims.a. " +
-		"See https://github.com/SAP/ui5-project/blob/master/docs/Configuration.md#specification-versions",
+		"Your UI5 CLI installation might be outdated. For details see " +
+		"https://sap.github.io/ui5-tooling/pages/Configuration/#specification-versions",
 		"Rejected with error");
 });
 
@@ -739,3 +740,23 @@ test("specVersion: Extension with valid version 1.0", async (t) => {
 	await preprocessor.applyExtension(extension);
 	t.deepEqual(handleShimStub.getCall(0).args[0].specVersion, "1.0", "Correct spec version");
 });
+
+test("specVersion: Extension with valid version 1.1", async (t) => {
+	const extension = {
+		id: "extension.a",
+		path: applicationAPath,
+		dependencies: [],
+		version: "1.0.0",
+		specVersion: "1.1",
+		kind: "extension",
+		type: "project-shim",
+		metadata: {
+			name: "shims.a"
+		},
+		shims: {}
+	};
+	const preprocessor = new Preprocessor();
+	const handleShimStub = sinon.stub(preprocessor, "handleShim");
+	await preprocessor.applyExtension(extension);
+	t.deepEqual(handleShimStub.getCall(0).args[0].specVersion, "1.1", "Correct spec version");
+});
diff --git a/test/lib/projectPreprocessor.js b/test/lib/projectPreprocessor.js
index 4e6b60ebc..d88b8e20f 100644
--- a/test/lib/projectPreprocessor.js
+++ b/test/lib/projectPreprocessor.js
@@ -1597,7 +1597,8 @@ test("specVersion: Project with invalid version", async (t) => {
 	};
 	await t.throwsAsync(projectPreprocessor.processTree(tree),
 		"Unsupported specification version 0.9 defined for project application.a. " +
-		"See https://github.com/SAP/ui5-project/blob/master/docs/Configuration.md#specification-versions",
+		"Your UI5 CLI installation might be outdated. For details see " +
+		"https://sap.github.io/ui5-tooling/pages/Configuration/#specification-versions",
 		"Rejected with error");
 });
 
@@ -1633,6 +1634,22 @@ test("specVersion: Project with valid version 1.0", async (t) => {
 	t.deepEqual(res.specVersion, "1.0", "Correct spec version");
 });
 
+test("specVersion: Project with valid version 1.1", async (t) => {
+	const tree = {
+		id: "application.a",
+		path: applicationAPath,
+		dependencies: [],
+		version: "1.0.0",
+		specVersion: "1.1",
+		type: "application",
+		metadata: {
+			name: "xy"
+		}
+	};
+	const res = await projectPreprocessor.processTree(tree);
+	t.deepEqual(res.specVersion, "1.1", "Correct spec version");
+});
+
 test("isBeingProcessed: Is not being processed", (t) => {
 	const preprocessor = new projectPreprocessor.ProjectPreprocessor();