X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=Documentation%2Fdiff-format.txt;h=001503205b24d5c20ec10792c4ab6c4c7221bcb7;hb=84d176cef65ad23e11643d463c69ad313b728eda;hp=18d49d2c3baa81983b19a938598eb091fb7809ef;hpb=30ba3809a4670c99c73800393ce29473c84c8521;p=git.git

diff --git a/Documentation/diff-format.txt b/Documentation/diff-format.txt
index 18d49d2c3..001503205 100644
--- a/Documentation/diff-format.txt
+++ b/Documentation/diff-format.txt
@@ -126,6 +126,13 @@ the file that rename/copy produces, respectively.
     If there is need for such substitution then the whole
     pathname is put in double quotes.
 
+The similarity index is the percentage of unchanged lines, and
+the dissimilarity index is the percentage of changed lines.  It
+is a rounded down integer, followed by a percent sign.  The
+similarity index value of 100% is thus reserved for two equal
+files, while 100% dissimilarity means that no line from the old
+file made it into the new one.
+
 
 combined diff format
 --------------------