Manlio Perillo <> writes:

> I'm not sure the man page is wrong and should be changed:
>   -- usage: git diff [<options>] [<commit> [<commit>]] [--] [<path>...]
>   ++ usage: git diff [<options>] [<commit> [<commit>]]

Comparison of two blob objects works entirely in different way (it
is not even recursively comparing two tree-shaped things).

I do not think this mode is common enough to deserve to be in the
short help text, but it should be in the documentation, perhaps like
this patch, I think.

 Documentation/git-diff.txt | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git c/Documentation/git-diff.txt w/Documentation/git-diff.txt
index f8d0819..f8c0601 100644
--- c/Documentation/git-diff.txt
+++ w/Documentation/git-diff.txt
@@ -12,6 +12,7 @@ SYNOPSIS
 'git diff' [options] [<commit>] [--] [<path>...]
 'git diff' [options] --cached [<commit>] [--] [<path>...]
 'git diff' [options] <commit> <commit> [--] [<path>...]
+'git diff' [options] <blob> <blob>
 'git diff' [options] [--no-index] [--] <path> <path>
@@ -55,6 +56,11 @@ directories. This behavior can be forced by --no-index.
        This is to view the changes between two arbitrary
+'git diff' [options] <blob> <blob>::
+       This form is to view the differences between the raw
+       contents of two blob objects.
 'git diff' [--options] <commit>..<commit> [--] [<path>...]::
        This is synonymous to the previous form.  If <commit> on
@@ -72,8 +78,7 @@ directories. This behavior can be forced by --no-index.
 Just in case if you are doing something exotic, it should be
 noted that all of the <commit> in the above description, except
 in the last two forms that use ".." notations, can be any
-<tree>.  The third form ('git diff <commit> <commit>') can also
-be used to compare two <blob> objects.
 For a more complete list of ways to spell <commit>, see
 "SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
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