Merge branch 'jk/maint-commit-document-editmsg' into maint

"$GIT_DIR/COMMIT_EDITMSG" file that is used to hold the commit log
message user edits was not documented.

* jk/maint-commit-document-editmsg:
  commit: document the temporary commit message file
diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index 2d695f6..81853e9 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -399,6 +399,15 @@
 and `post-commit` hooks.  See linkgit:githooks[5] for more
 information.
 
+FILES
+-----
+
+`$GIT_DIR/COMMIT_EDITMSG`::
+	This file contains the commit message of a commit in progress.
+	If `git commit` exits due to an error before creating a commit,
+	any commit message that has been provided by the user (e.g., in
+	an editor session) will be available in this file, but will be
+	overwritten by the next invocation of `git commit`.
 
 SEE ALSO
 --------