add more informative error messages to git-mktag

diff --git a/Documentation/git-whatchanged.txt b/Documentation/git-whatchanged.txt
index e6f57d9bc1a318ed332c3b46a10d6de824a37a07..e8f21d02f774a914e7e8840150f6db86a2884178 100644 (file)
--- a/Documentation/git-whatchanged.txt
+++ b/Documentation/git-whatchanged.txt
@@ -3,7 +3,7 @@ git-whatchanged(1)
 
 NAME
 ----
-git-whatchanged - Show logs with difference each commit introduces.
+git-whatchanged - Show logs with difference each commit introduces
 
 
 SYNOPSIS
@@ -47,9 +47,23 @@ OPTIONS
        By default, differences for merge commits are not shown.
        With this flag, show differences to that commit from all
        of its parents.
++
+However, it is not very useful in general, although it
+*is* useful on a file-by-file basis.
+
+Examples
+--------
+git-whatchanged -p v2.6.12.. include/scsi drivers/scsi::
+
+       Show as patches the commits since version 'v2.6.12' that changed
+       any file in the include/scsi or drivers/scsi subdirectories
+
+git-whatchanged --since="2 weeks ago" \-- gitk::
+
+       Show the changes during the last two weeks to the file 'gitk'.
+       The "--" is necessary to avoid confusion with the *branch* named
+       'gitk'
 
-       However, it is not very useful in general, although it
-       *is* useful on a file-by-file basis.
 
 Author
 ------