t4200: skip gc-rerere test on systems with non GNU date.

diff --git a/Documentation/git-commit-tree.txt b/Documentation/git-commit-tree.txt
index 77ba96ed8a4820354ef6d2ff4265660385289f3d..cf25507f8f37194461e939bfa389ca00af05a5b1 100644 (file)
--- a/Documentation/git-commit-tree.txt
+++ b/Documentation/git-commit-tree.txt
@@ -3,7 +3,7 @@ git-commit-tree(1)
 
 NAME
 ----
-git-commit-tree - Creates a new commit object
+git-commit-tree - Create a new commit object
 
 
 SYNOPSIS
@@ -12,6 +12,9 @@ SYNOPSIS
 
 DESCRIPTION
 -----------
+This is usually not what an end user wants to run directly.  See
+gitlink:git-commit[1] instead.
+
 Creates a new commit object based on the provided tree object and
 emits the new commit object id on stdout. If no parent is given then
 it is considered to be an initial tree.