diff --git a/src/versionbits.h b/src/versionbits.h
index 0ac17287da9..f88ead0dce6 100644
--- a/src/versionbits.h
+++ b/src/versionbits.h
@@ -72,7 +72,8 @@ struct BIP9GBTStatus {
 };
 
 /** BIP 9 allows multiple softforks to be deployed in parallel. We cache
- *  per-period state for every one of them. */
+ *  per-period state for every one we implement and warning state for each
+ *  BIP 323 allowed bit. */
 class VersionBitsCache
 {
 private: