diff --git a/lib/libc/gen/alarm.3 b/lib/libc/gen/alarm.3
index 8aeda29481e..4a24cc6d721 100644
--- a/lib/libc/gen/alarm.3
+++ b/lib/libc/gen/alarm.3
@@ -63,7 +63,7 @@ Due to
 .Xr setitimer 2
 restriction the maximum number of
 .Fa seconds
-allowed is 100000000.
+allowed is 100,000,000.
 .Sh RETURN VALUES
 The return value of
 .Fn alarm
diff --git a/lib/libc/gen/ualarm.3 b/lib/libc/gen/ualarm.3
index f4e0973b133..dfd9ddd5f43 100644
--- a/lib/libc/gen/ualarm.3
+++ b/lib/libc/gen/ualarm.3
@@ -70,7 +70,7 @@ restriction the maximum number of
 .Fa microseconds
 and
 .Fa interval
-is limited to 100000000000000
+is limited to 100,000,000,000,000
 (in case this value fits in the unsigned integer).
 .Sh RETURN VALUES
 When the signal has successfully been caught,