diff --git a/policies/llrf.policies b/policies/llrf.policies
index af87e1c..ba22c61 100644
--- a/policies/llrf.policies
+++ b/policies/llrf.policies
@@ -332,7 +332,7 @@ Examples for ttl settings:
       ],
       "waveform":[
          {
-            "ttl":"P6H",
+            "ttl":"PT6H",
             "modulo":1
          }
       ]