Add missing doc of FcDirCacheCreateUUID
diff --git a/doc/fccache.fncs b/doc/fccache.fncs
index 34ce63f..17e74fe 100644
--- a/doc/fccache.fncs
+++ b/doc/fccache.fncs
@@ -71,7 +71,8 @@
@FUNC@ FcDirCacheClean
@TYPE1@ const FcChar8 * @ARG1@ cache_dir
@TYPE2@ FcBool @ARG2@ verbose
-@PURPOSE@
+@PURPOSE@ Clean up a cache directory
+@DESC@
This tries to clean up the cache directory of <parameter>cache_dir</parameter>.
This returns FcTrue if the operation is successfully complete. otherwise FcFalse.
@SINCE@ 2.9.91
@@ -86,3 +87,18 @@
to <parameter>config</parameter>.
@SINCE@ 2.9.91
@@
+
+@RET@ FcBool
+@FUNC@ FcDirCacheCreateUUID
+@TYPE1@ FcChar8 * @ARG1@ dir
+@TYPE2@ FcBool @ARG2@ force
+@TYPE3@ FcConfig @ARG3@ config
+@PURPOSE@ Create .uuid file at a directory
+@DESC@
+This is to create .uuid file containing an UUID at a font directory of
+<parameter>dir</parameter>.
+The UUID will be used to identify the font directory and is used to determine
+the cache filename if available.
+@SINCE@ 2.12.92
+@@
+
