diff --git a/docs/csharp/language-reference/keywords/when.md b/docs/csharp/language-reference/keywords/when.md
index 4de4d4539ada2..063e8a8f5c29f 100644
--- a/docs/csharp/language-reference/keywords/when.md
+++ b/docs/csharp/language-reference/keywords/when.md
@@ -20,7 +20,7 @@ You can use the `when` contextual keyword to specify a filter condition in two c
 Starting with C# 6, `when` can be used in a `catch` statement to specify a condition that must be true for the handler for a specific exception to execute. Its syntax is:
 
 ```csharp
-catch ExceptionType [e] when (expr)
+catch (ExceptionType [e]) when (expr)
 ```
 where *expr* is an expression that evaluates to a Boolean value. If it returns `true`, the exception handler executes; if `false`, it does not.