+Configuration
+-------------
+
+The command honors `core.filemode` configuration variable. If
+your repository is on an filesystem whose executable bits are
+unreliable, this should be set to 'false'. This causes the
+command to ignore differences in file modes recorded in the
+index and the file mode on the filesystem if they differ only on
+executable bit. On such an unfortunate filesystem, you may
+need to use `git-update-index --chmod=`.
+