diff --git a/docs/docs.md b/docs/docs.md
index ff2a1a5..5400f54 100644
--- a/docs/docs.md
+++ b/docs/docs.md
@@ -506,6 +506,7 @@ post on the meshtastic.discourse.group and we'll try to help.
 | Unspecified | 4 | Not normally used |
 | UBloxInitFailed | 5 | We failed while configuring a UBlox GPS |
 | NoAXP192 | 6 | This board was expected to have a power management chip and it is missing or broken |
+| InvalidRadioSetting | 7 | The channel tried to set a radio setting which is not supported by this chipset, radio comms settings are now undefined. |
 
 
 
diff --git a/mesh.proto b/mesh.proto
index f07da44..c53d2e5 100644
--- a/mesh.proto
+++ b/mesh.proto
@@ -689,23 +689,27 @@ message NodeInfo {
 enum CriticalErrorCode { 
   None = 0;
 
-  /// A software bug was detected while trying to send lora
+  // A software bug was detected while trying to send lora
   TxWatchdog = 1;
 
-  /// A software bug was detected on entry to sleep
+  // A software bug was detected on entry to sleep
   SleepEnterWait = 2; 
 
-  /// No Lora radio hardware could be found
+  // No Lora radio hardware could be found
   NoRadio = 3;
 
-  /// Not normally used
+  // Not normally used
   Unspecified = 4;
 
-  /// We failed while configuring a UBlox GPS
+  // We failed while configuring a UBlox GPS
   UBloxInitFailed = 5;
 
-  /// This board was expected to have a power management chip and it is missing or broken
+  // This board was expected to have a power management chip and it is missing or broken
   NoAXP192 = 6;
+
+  // The channel tried to set a radio setting which is not supported by this chipset, 
+  // radio comms settings are now undefined.
+  InvalidRadioSetting = 7;
 }
 
 /**