diff --git a/config-dist.php b/config-dist.php
index e82d7bd38c3..eb0ab29c901 100644
--- a/config-dist.php
+++ b/config-dist.php
@@ -234,6 +234,10 @@ $CFG->admin = 'admin';
 //         '/filedir'   => '/var/www/moodle/filedir',  // for custom $CFG->filedir locations
 //     );
 //
+// YUI caching may be sometimes improved by slasharguments:
+//     $CFG->yuislasharguments = 1;
+// Some servers may need a special rewrite rule to work around internal path length limitations:
+// RewriteRule (^.*/theme/yui_combo\.php)(/.*) $1?file=$2
 //
 //
 // This setting will prevent the 'My Courses' page being displayed when a student
diff --git a/lib/outputrequirementslib.php b/lib/outputrequirementslib.php
index aa8755e48b8..c4fdd8f200c 100644
--- a/lib/outputrequirementslib.php
+++ b/lib/outputrequirementslib.php
@@ -152,7 +152,8 @@ class page_requirements_manager {
     public function __construct() {
         global $CFG;
 
-        $sep = empty($CFG->slasharguments) ? '?' : '/';
+        // You may need to set up URL rewrite rule because oversized URLs might not be allowed by web server.
+        $sep = empty($CFG->yuislasharguments) ? '?' : '/';
 
         require_once("$CFG->libdir/yui/phploader/phploader/loader.php");