clarify -M without % symbol in diff-options

Signed-off-by: Sitaram Chamarty <sitaramc@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index cf4b21659890ba4babb8bcc07a7c0e84a03b6adb..1fb6f2d4e92ee2f6429af20515f25a551e0f869c 100644 (file)
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -308,7 +308,11 @@ endif::git-log[]
        index (i.e. amount of addition/deletions compared to the
        file's size). For example, `-M90%` means git should consider a
        delete/add pair to be a rename if more than 90% of the file
-       hasn't changed.
+       hasn't changed.  Without a `%` sign, the number is to be read as
+       a fraction, with a decimal point before it.  I.e., `-M5` becomes
+       0.5, and is thus the same as `-M50%`.  Similarly, `-M05` is
+       the same as `-M5%`.  To limit detection to exact renames, use
+       `-M100%`.
 
 -C[<n>]::
 --find-copies[=<n>]::