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-rw-r--r--lisp/vc.el7
1 files changed, 4 insertions, 3 deletions
diff --git a/lisp/vc.el b/lisp/vc.el
index 6169c2a6684..e29603fcc1c 100644
--- a/lisp/vc.el
+++ b/lisp/vc.el
@@ -1609,9 +1609,10 @@ saving the buffer."
;;;###autoload
(defun vc-root-diff (historic &optional not-urgent)
- "Display diffs between file revisions.
-Normally this compares the currently selected fileset with their
-working revisions. With a prefix argument HISTORIC, it reads two revision
+ "Display diffs between VC-controlled whole tree revisions.
+Normally, this compares the tree corresponding to the current
+fileset with the working revision.
+With a prefix argument HISTORIC, prompt for two revision
designators specifying which revisions to compare.
The optional argument NOT-URGENT non-nil means it is ok to say no to