diff --git a/lib/corereqs.js b/lib/corereqs.js
index 255a363..1dd0518 100644
--- a/lib/corereqs.js
+++ b/lib/corereqs.js
@@ -535,6 +535,14 @@ module.exports = {
            return [ 'CCSLSxx', [ 34, key, 3, wid, modifiers ] ];
        }
    ],
+   
+   GrabServer: [
+       [ 'CxS', [36, 1]]
+   ],
+
+   UngrabServer: [
+       [ 'CxS', [37, 1]]
+   ],
 
    QueryPointer: [
        [ 'CxSL', [38, 2] ],