revision.c: explain what tree_difference does

diff --git a/Documentation/git-shortlog.txt b/Documentation/git-shortlog.txt
index d54fc3e5c6d7ba3be31fa2c1238e2d7039c92e74..b0df92e8192bc494e5d4db1707c233790560afb8 100644 (file)
--- a/Documentation/git-shortlog.txt
+++ b/Documentation/git-shortlog.txt
@@ -8,6 +8,7 @@ git-shortlog - Summarize 'git log' output
 SYNOPSIS
 --------
 git-log --pretty=short | 'git-shortlog' [-h] [-n] [-s]
+git-shortlog [-n|--number] [-s|--summary] [<committish>...]
 
 DESCRIPTION
 -----------
@@ -28,7 +29,7 @@ OPTIONS
        of author alphabetic order.
 
 -s::
-       Supress commit description and provide a commit count summary only.
+       Suppress commit description and provide a commit count summary only.
 
 FILES
 -----