diff --git a/commands/update-capabilities.proto b/commands/update-capabilities.proto
new file mode 100644
index 0000000..f636564
--- /dev/null
+++ b/commands/update-capabilities.proto
@@ -0,0 +1,21 @@
+message UpdateCapabilitiesCommandMessage {
+	message Name {
+		repeated bytes components = 8;
+	}
+
+	message CapabilitiesParameter {
+		required string parameterType = 228; // should be a protobuf type
+		optional string parameterDesc = 229; // what is this parameter for? (recommended)
+	}
+
+	message Capability {
+		required Name commandPrefix = 230; // the name (after device prefix) of command 
+		repeated string keywords = 231; // other devices can search for one or more keywords
+						// e.g. 'cec', 'motion', 'thermostat'
+		repeated CapabilitiesParameter parameterDesc = 232; // list of parameter descriptions
+        optional bool needsSignature=233;
+        required String deviceSerial=234;
+	}
+
+    repeated Capability capabilities = 235;
+}