diff --git a/gpg/README.md b/gpg/README.md
index 1bec038..4a15a17 100644
--- a/gpg/README.md
+++ b/gpg/README.md
@@ -41,7 +41,7 @@ $ gpg -k
 ### Copy Public Key
 
 ```console
-$ gpg --export --armor <user-id> | xclip -sel clip
+gpg --export --armor $(gpg -K --with-colons --keyid-format SHORT | awk -F: '/^pub:/ { print $5 }') | xclip -sel clip
 ```
 
 ### Copy Private key (Caution)