diff --git a/raft/log.go b/raft/log.go
index 94258a149..cb3e26e6d 100644
--- a/raft/log.go
+++ b/raft/log.go
@@ -50,7 +50,7 @@ func (l *raftLog) String() string {
 }
 
 // maybeAppend returns (0, false) if the entries cannot be appended. Otherwise,
-// it returns (last index of entries, true).
+// it returns (last index of new entries, true).
 func (l *raftLog) maybeAppend(index, logTerm, committed uint64, ents ...pb.Entry) (lastnewi uint64, ok bool) {
 	lastnewi = index + uint64(len(ents))
 	if l.matchTerm(index, logTerm) {
diff --git a/raft/log_test.go b/raft/log_test.go
index 3aef2e1b3..46072f376 100644
--- a/raft/log_test.go
+++ b/raft/log_test.go
@@ -202,8 +202,8 @@ func TestLogMaybeAppend(t *testing.T) {
 			lastindex, true, commit, false, // commit do not decrease
 		},
 		{
-			lastterm - 3, lastindex - 3, lastindex, nil,
-			1, true, commit, false, // commit do not decrease
+			0, 0, lastindex, nil,
+			0, true, commit, false, // commit do not decrease
 		},
 		{
 			lastterm, lastindex, lastindex, []pb.Entry{{Term: 4}},