Docs: update refresh_pattern description regarding 'max' option

diff --git a/src/cf.data.pre b/src/cf.data.pre
index 28f7da6f8c2f49afa4da6b79479a77f58e1cb2d9..1799e7a44d334c11a10a2d4f8bda5b6307d72ec1 100644 (file)
--- a/src/cf.data.pre
+++ b/src/cf.data.pre
@@ -5401,7 +5401,9 @@ DOC_START
        will be considered fresh.
 
        'Max' is an upper limit on how long objects without an explicit
-       expiry time will be considered fresh.
+       expiry time will be considered fresh. The value is also used
+       to form Cache-Control: max-age header for a request sent from
+       Squid to origin/parent.
 
        options: override-expire
                 override-lastmod