diff --git a/docs/basic/troubleshooting/types.md b/docs/basic/troubleshooting/types.md
index 0b8af4ca..e928d7bc 100644
--- a/docs/basic/troubleshooting/types.md
+++ b/docs/basic/troubleshooting/types.md
@@ -138,7 +138,7 @@ You can also assert a property is non-null, when accessing it:
 
 ```ts
 element.parentNode!.removeChild(element) // ! before the period
-myFunction(document.getElementById(dialog.id!)! // ! after the property accessing
+myFunction(document.getElementById(dialog.id!)!) // ! after the property accessing
 let userID!: string // definite assignment assertion... be careful!
 ```