Documentation/diff-options.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index f4f7e25..39f2c50 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -309,7 +309,11 @@ 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%`.

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