diff --git a/libcockatrice_protocol/libcockatrice/protocol/pb/response.proto b/libcockatrice_protocol/libcockatrice/protocol/pb/response.proto
index 2bbf5c55b..e1f415ce6 100644
--- a/libcockatrice_protocol/libcockatrice/protocol/pb/response.proto
+++ b/libcockatrice_protocol/libcockatrice/protocol/pb/response.proto
@@ -79,7 +79,7 @@ message Response {
         REPLAY_LIST = 1100;             // Response listing replays
         REPLAY_DOWNLOAD = 1101;         // Response for replay download
         REPLAY_GET_CODE = 1102;         // Response containing replay code
-        CARD_ART_RULE_LIST = 1200;
+        CARD_ART_RULE_LIST = 1200;      // Response containing a list of card art rules
     }
 
     required uint64 cmd_id = 1;              // Command ID that this response corresponds to