diff --git a/src/port/pgsleep.c b/src/port/pgsleep.c
index 84e1c3049a..8e76bf9fa7 100644
--- a/src/port/pgsleep.c
+++ b/src/port/pgsleep.c
@@ -28,8 +28,8 @@
  * pg_usleep --- delay the specified number of microseconds.
  *
  * NOTE: although the delay is specified in microseconds, the effective
- * resolution is only 1/HZ, or 10 milliseconds, on most Unixen.  Expect
- * the requested delay to be rounded up to the next resolution boundary.
+ * resolution is only 1/HZ, or up to several milliseconds, on most Unixen.
+ * Expect the requested delay to be rounded up to the next resolution boundary.
  *
  * On machines where "long" is 32 bits, the maximum delay is ~2000 seconds.
  *