--- a/.bash_prompt	Sun Sep 07 18:58:52 2014 +0900
+++ b/.bash_prompt	Mon Sep 08 00:09:14 2014 +0900
@@ -121,6 +121,11 @@
         local AHEAD="$Y^"
         [[ $STATUS =~ ahead[^$'\n']+([0-9]+)' 'commit ]] && AHEAD+=${BASH_REMATCH[1]}
     fi
+    if [[ $STATUS == *detached* ]] ; then
+        REV="$P$REV"
+    else
+        REV="$G$REV"
+    fi
     if [[ $STATUS == *'Changes to be committed'* ]] ; then
         local STAGED="$R!"
     fi
@@ -128,7 +133,7 @@
         local UNSTAGED="$P?"
     fi
 
-    GIT_INFO=" ${G}${BRANCH}±${P}${REV}${BEHIND}${AHEAD}${STAGED}${UNSTAGED}${RESET}"
+    GIT_INFO=" ${G}${BRANCH}±${REV}${BEHIND}${AHEAD}${STAGED}${UNSTAGED}${RESET}"
 }
 
 # first find prompt in hgrc, then check it's actually enabled