diff --git a/powerlevel9k.zsh-theme b/powerlevel9k.zsh-theme
index cdb04d8a..35c2deb8 100644
--- a/powerlevel9k.zsh-theme
+++ b/powerlevel9k.zsh-theme
@@ -38,6 +38,7 @@ autoload -Uz vcs_info
 local VCS_WORKDIR_DIRTY=false
 local VCS_CHANGESET_PREFIX=''
 if ( $POWERLEVEL9K_SHOW_CHANGESET ); then
+  # Just display the first 12 characters of our changeset-ID.
   VCS_CHANGESET_PREFIX='%12.12i@'
 fi