The name of the hash function is "SHA-1", not "SHA1"

diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index 77a912d4ea0421ad604b3271a1e36975906d95f0..670e9fb2c2baa1ce40415d273c08d5b137868432 100644 (file)
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -145,7 +145,15 @@ you will need to handle the situation manually.
 
 --index-version <n>::
        Write the resulting index out in the named on-disk format version.
-       The current default version is 2.
+       Supported versions are 2, 3 and 4. The current default version is 2
+       or 3, depending on whether extra features are used, such as
+       `git add -N`.
++
+Version 4 performs a simple pathname compression that reduces index
+size by 30%-50% on large repositories, which results in faster load
+time. Version 4 is relatively young (first released in in 1.8.0 in
+October 2012). Other Git implementations such as JGit and libgit2
+may not support it yet.
 
 -z::
        Only meaningful with `--stdin` or `--index-info`; paths are
@@ -239,7 +247,7 @@ $ git update-index --index-info
 ------------
 
 The first line of the input feeds 0 as the mode to remove the
-path; the SHA1 does not matter as long as it is well formatted.
+path; the SHA-1 does not matter as long as it is well formatted.
 Then the second and third line feeds stage 1 and stage 2 entries
 for that path.  After the above, we would end up with this: