diff --git a/gtests/net/packetdrill/tests/bsd/tcp/close/close-read-data-fin.pkt b/gtests/net/packetdrill/tests/bsd/tcp/close/close-read-data-fin.pkt
index 90288b22d89c4e995e1edaf79f9aa27b2ef13f10..46e340b0211f6afce6ce7faabc3cfca8f4992635 100644
--- a/gtests/net/packetdrill/tests/bsd/tcp/close/close-read-data-fin.pkt
+++ b/gtests/net/packetdrill/tests/bsd/tcp/close/close-read-data-fin.pkt
@@ -14,12 +14,15 @@
 
 // We receive first segment
 0.210 < P. 1:1001(1000) ack 1 win 65535
+
+// We send one ACK
 0.350 > . 1:1(0) ack 1001 win 1026
 
 // Our application writes 1000 bytes
 0.400 write(4, ..., 1000) = 1000
 0.400 > P. 1:1001(1000) ack 1001
 
+// Client sends one ACK
 0.410 < . 1001:1001(0) ack 1001 win 65535
 
 0.420 read(4, ..., 1000) = 1000