diff --git a/lib/ngtcp2_conn.c b/lib/ngtcp2_conn.c
index 741995016f867a924c441721d60d93305930ae10..0f41132fbe2125be1ae2b576604c6a8e4f28bf29 100644
--- a/lib/ngtcp2_conn.c
+++ b/lib/ngtcp2_conn.c
@@ -1110,8 +1110,8 @@ static int conn_create_ack_frame(ngtcp2_conn *conn, ngtcp2_frame **pfr,
                                  ngtcp2_pktns *pktns, uint8_t type,
                                  ngtcp2_tstamp ts, ngtcp2_duration ack_delay,
                                  uint64_t ack_delay_exponent) {
-  /* TODO Measure an actual size of ACK bloks to find the best default
-     value. */
+  /* TODO Measure an actual size of ACK blocks to find the best
+     default value. */
   const size_t initial_max_ack_blks = 8;
   int64_t last_pkt_num;
   ngtcp2_acktr *acktr = &pktns->acktr;
diff --git a/lib/ngtcp2_rtb.c b/lib/ngtcp2_rtb.c
index 83308e8e88c4dbf9b19972e271f00cb00ab73b55..bbbea2d8dbb41d9d209acfde70d00600ab5f4d51 100644
--- a/lib/ngtcp2_rtb.c
+++ b/lib/ngtcp2_rtb.c
@@ -798,8 +798,7 @@ static int rtb_pkt_lost(ngtcp2_rtb *rtb, ngtcp2_conn_stat *cstat,
 }
 
 /*
- * rtb_compute_pkt_loss_delay computes delay until packet is
- * considered lost in NGTCP2_MICROSECONDS resolution.
+ * rtb_compute_pkt_loss_delay computes loss delay.
  */
 static ngtcp2_duration compute_pkt_loss_delay(const ngtcp2_conn_stat *cstat) {
   /* 9/8 is kTimeThreshold */