diff --git a/dotfiles/zshrc b/dotfiles/zshrc
index 5854825..3dc3abb 100644
--- a/dotfiles/zshrc
+++ b/dotfiles/zshrc
@@ -97,6 +97,7 @@ export GPG_TTY=$(tty)
 # Refresh gpg-agent tty in case user switches into an X Session
 gpg-connect-agent updatestartuptty /bye >/dev/null
 
+# Export location to SSH agent socket, see ssh-agent.service
 export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/ssh-agent.socket"
 
 # Speed up JVM start for short-lived Java programs