X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=Documentation%2Fgit-patch-id.txt;h=723b8ccbf61e9134c31a2f07202695f03bfc9ea3;hb=7561d9f54412fcf443ebb28040bad67cd054a986;hp=3e560a37e835bb59f12754591c5c32bac671f57c;hpb=a7154e916c6fab01dfb67629dae8c4430daff669;p=git.git

diff --git a/Documentation/git-patch-id.txt b/Documentation/git-patch-id.txt
index 3e560a37..723b8ccb 100644
--- a/Documentation/git-patch-id.txt
+++ b/Documentation/git-patch-id.txt
@@ -3,7 +3,7 @@ git-patch-id(1)
 
 NAME
 ----
-git-patch-id - Generate a patch ID.
+git-patch-id - Generate a patch ID
 
 SYNOPSIS
 --------
@@ -18,6 +18,12 @@ ID" are almost guaranteed to be the same thing.
 
 IOW, you can use this thing to look for likely duplicate commits.
 
+When dealing with git-diff-tree output, it takes advantage of
+the fact that the patch is prefixed with the object name of the
+commit, and outputs two 40-byte hexadecimal string.  The first
+string is the patch ID, and the second string is the commit ID.
+This can be used to make a mapping from patch ID to commit ID.
+
 OPTIONS
 -------
 <patch>::