diff --git a/vscode.proposed.d.ts b/vscode.proposed.d.ts
index f56f3abdf4..b803dce0f8 100644
--- a/vscode.proposed.d.ts
+++ b/vscode.proposed.d.ts
@@ -360,7 +360,7 @@ declare module 'vscode' {
 		 *
 		 * Messages are only delivered if the editor is live.
 		 *
-		 * @param message Body of the message. This must be a string or other json serilizable object.
+		 * @param message Body of the message. This must be a string or other json serializable object.
 		 */
 		postMessage(message: any): Thenable<boolean>;
 
@@ -562,7 +562,7 @@ declare module 'vscode' {
 		 *
 		 * Messages are only delivered if the editor is live.
 		 *
-		 * @param message Body of the message. This must be a string or other json serilizable object.
+		 * @param message Body of the message. This must be a string or other json serializable object.
 		 */
 		postMessage(message: any): Thenable<boolean>;