diff --git a/kolite/kolite.d.ts b/kolite/kolite.d.ts
index 42efda4a9..4aa55fd81 100644
--- a/kolite/kolite.d.ts
+++ b/kolite/kolite.d.ts
@@ -58,6 +58,10 @@ interface KoliteCommand {
     execute(...args: any[]): any;
 }
 
+interface KoliteAsyncCommand extends KoliteCommand {
+    isExecuting: KnockoutObservable<boolean>;
+}
+
 interface KoLiteCommandOptions {
     execute?: any;
     canExecute?: (isExecuting: boolean) => any;
@@ -65,7 +69,7 @@ interface KoLiteCommandOptions {
 
 interface KnockoutStatic {
     command(options: KoLiteCommandOptions): KoliteCommand;
-    asyncCommand(optons: KoLiteCommandOptions): KoliteCommand;
+    asyncCommand(optons: KoLiteCommandOptions): KoliteAsyncCommand;
 }
 
 interface KnockoutUtils {