added documentation for ediff-backup

diff --git a/man/ediff.texi b/man/ediff.texi
index 318ac9e5c3f5bac5dac1541608ccd263a654e4d8..8e176a49fe03b7e651496ed11f80904b0331b13a 100644 (file)
--- a/man/ediff.texi
+++ b/man/ediff.texi
@@ -155,6 +155,12 @@ Compare, Merge, and Apply Patch.
 @findex ediff
 Compare two files.
 
+@item ediff-backup
+@findex ediff-backup
+Compare a file with its backup. If there are several numerical backups, use
+the latest. If the file is itself a backup, then compare it with its
+original.
+
 @item ediff-buffers
 @findex ediff-buffers
 Compare two buffers.