fsmonitor: add documentation for the fsmonitor extension.

diff --git a/Documentation/config.txt b/Documentation/config.txt
index dc4e3f58a2d2e8a5a6753bd290d65fec4f7f7b21..db52645cb4d1b0abe5e28af3357aac0590e127a1 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -413,6 +413,13 @@ core.protectNTFS::
        8.3 "short" names.
        Defaults to `true` on Windows, and `false` elsewhere.
 
+core.fsmonitor::
+       If set, the value of this variable is used as a command which
+       will identify all files that may have changed since the
+       requested date/time. This information is used to speed up git by
+       avoiding unnecessary processing of files that have not changed.
+       See the "fsmonitor-watchman" section of linkgit:githooks[5].
+
 core.trustctime::
        If false, the ctime differences between the index and the
        working tree are ignored; useful when the inode change time