diff --git a/docs/cmd/kn_completion.md b/docs/cmd/kn_completion.md
index 2e6daa73e..c7d9030c2 100644
--- a/docs/cmd/kn_completion.md
+++ b/docs/cmd/kn_completion.md
@@ -25,6 +25,7 @@ kn completion [SHELL] [flags]
 
  # Generate completion code for zsh
  source <(kn completion zsh)
+ compdef _kn kn
 ```
 
 ### Options
diff --git a/pkg/kn/commands/completion/completion.go b/pkg/kn/commands/completion/completion.go
index e45358fba..c2d55f1ac 100644
--- a/pkg/kn/commands/completion/completion.go
+++ b/pkg/kn/commands/completion/completion.go
@@ -36,7 +36,8 @@ Supported Shells:
  source <(kn completion bash)
 
  # Generate completion code for zsh
- source <(kn completion zsh)`
+ source <(kn completion zsh)
+ compdef _kn kn`
 )
 
 // NewCompletionCommand implements shell auto-completion feature for Bash and Zsh