diff --git a/openflow_input/nicira_dec_ttl b/openflow_input/nicira_dec_ttl
index 33a80a6..77649af 100644
--- a/openflow_input/nicira_dec_ttl
+++ b/openflow_input/nicira_dec_ttl
@@ -28,10 +28,10 @@
 #version any
 
 struct of_action_nicira_dec_ttl {
-    uint16_t type;      // OF_ACTION_TYPE_EXPERIMENTER
+    uint16_t type == 65535;
     uint16_t len;
-    uint32_t experimenter;    // OF_EXPERIMENTER_ID_NICIRA
-    uint16_t subtype;         // 18
+    uint32_t experimenter == 0x2320;
+    uint16_t subtype == 18;
     pad(2);
     pad(4);
 };