diff --git a/internal/consensus/state.go b/internal/consensus/state.go
index 32b6357b3..a792b4707 100644
--- a/internal/consensus/state.go
+++ b/internal/consensus/state.go
@@ -2414,6 +2414,8 @@ func repairWalFile(src, dst string) error {
 }
 
 // proposerWaitTime determines how long the proposer should wait to propose its next block.
+// If the result is zero, a block can be proposed immediately.
+//
 // Block times must be monotonically increasing, so if the block time of the previous
 // block is larger than the proposer's current time, then the proposer will sleep
 // until its local clock exceeds the previous block time.