diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index de92b6b7a37..978c31dd58c 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -2235,24 +2235,6 @@ declare module 'vscode' {
 		resolveCodeLens?(codeLens: CodeLens, token: CancellationToken): ProviderResult<CodeLens>;
 	}
 
-
-	/**
-	 */
-	export class CodeInset {
-		range: Range;
-		height?: number;
-		constructor(range: Range, height?: number);
-	}
-
-	export interface CodeInsetProvider {
-
-		onDidChangeCodeInsets?: Event<void>;
-
-		provideCodeInsets(document: TextDocument, token: CancellationToken): ProviderResult<CodeInset[]>;
-		resolveCodeInset?(codeInset: CodeInset, webview: Webview, token: CancellationToken): ProviderResult<CodeInset>;
-	}
-
-
 	/**
 	 * Information about where a symbol is defined.
 	 *
@@ -7873,12 +7855,6 @@ declare module 'vscode' {
 		 */
 		export function registerCodeLensProvider(selector: DocumentSelector, provider: CodeLensProvider): Disposable;
 
-		/**
-		 * Register a code inset provider.
-		 *
-		 */
-		export function registerCodeInsetProvider(selector: DocumentSelector, provider: CodeInsetProvider): Disposable;
-
 		/**
 		 * Register a definition provider.
 		 *
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 2ad45164371..ed37fac7b1d 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -33,6 +33,34 @@ declare module 'vscode' {
 
 	export namespace workspace {
 		export function registerRemoteAuthorityResolver(authorityPrefix: string, resolver: RemoteAuthorityResolver): Disposable;
+
+	}
+	//#endregion
+
+
+	// #region Joh - code insets
+
+	/**
+	 */
+	export class CodeInset {
+		range: Range;
+		height?: number;
+		constructor(range: Range, height?: number);
+	}
+
+	export interface CodeInsetProvider {
+		onDidChangeCodeInsets?: Event<void>;
+		provideCodeInsets(document: TextDocument, token: CancellationToken): ProviderResult<CodeInset[]>;
+		resolveCodeInset?(codeInset: CodeInset, webview: Webview, token: CancellationToken): ProviderResult<CodeInset>;
+	}
+
+	export namespace languages {
+
+		/**
+		 * Register a code inset provider.
+		 *
+		 */
+		export function registerCodeInsetProvider(selector: DocumentSelector, provider: CodeInsetProvider): Disposable;
 	}
 
 	//#endregion
diff --git a/src/vs/workbench/api/node/extHost.api.impl.ts b/src/vs/workbench/api/node/extHost.api.impl.ts
index ab17d0ac50e..a3dc698c3b0 100644
--- a/src/vs/workbench/api/node/extHost.api.impl.ts
+++ b/src/vs/workbench/api/node/extHost.api.impl.ts
@@ -305,6 +305,7 @@ export function createApiFactory(
 				return extHostLanguageFeatures.registerCodeLensProvider(extension, checkSelector(selector), provider);
 			},
 			registerCodeInsetProvider(selector: vscode.DocumentSelector, provider: vscode.CodeInsetProvider): vscode.Disposable {
+				checkProposedApiEnabled(extension);
 				return extHostLanguageFeatures.registerCodeInsetProvider(extension, checkSelector(selector), provider);
 			},
 			registerDefinitionProvider(selector: vscode.DocumentSelector, provider: vscode.DefinitionProvider): vscode.Disposable {