diff --git a/lisp/vc/vc-git.el b/lisp/vc/vc-git.el
index b6feb3b8d1..1637f1106f 100644
--- a/lisp/vc/vc-git.el
+++ b/lisp/vc/vc-git.el
@@ -1018,7 +1018,10 @@ vc-git-print-log
     ;; read-only.
     (let ((inhibit-read-only t))
       (with-current-buffer buffer
-	(insert "\n")
+        (overlay-put (make-overlay (point) (progn (insert (propertize "\n" 'help-echo
+          "You can use `d' on the top empty line to compare with the current working revision"))
+          (point)))
+          'invisible t)
 	(apply 'vc-git-command buffer
 	       'async files
 	       (append
@@ -1122,7 +1125,8 @@ vc-git-log-view-mode
 	     (1 'change-log-acknowledgment)
 	     (2 'change-log-acknowledgment))
 	    ("^Date:   \\(.+\\)" (1 'change-log-date))
-	    ("^summary:[ \t]+\\(.+\\)" (1 'log-view-message)))))))
+	    ("^summary:[ \t]+\\(.+\\)" (1 'log-view-message))))))
+  (reveal-mode 1))
 
 
 (defun vc-git-show-log-entry (revision)