diff --git a/proto/tendermint/abci/types.proto b/proto/tendermint/abci/types.proto
index d8143feb3..31a9c72fe 100644
--- a/proto/tendermint/abci/types.proto
+++ b/proto/tendermint/abci/types.proto
@@ -424,6 +424,10 @@ message ExecTxResult {
 // TxResult contains results of executing the transaction.
 //
 // One usage is indexing transaction results.
+// TODO(thane): Remove this struct. It's effectively only used in
+//              types/events.go#EventDataTx and these fields could easily be
+//              introduced directly into that struct. There doesn't seem to be
+//              any other use for this struct via any other interface.
 message TxResult {
   int64        height = 1;
   uint32       index  = 2;