diff --git a/share/man/man4/led.4 b/share/man/man4/led.4
index a2b2b589e8c0..f3afc6a0b198 100644
--- a/share/man/man4/led.4
+++ b/share/man/man4/led.4
@@ -122,6 +122,12 @@ Letters
 .Ql j
 turn the annunciator off for 1/10th
 to one full second.
+Letters
+.Ql u
+and
+.Ql U
+turns the annunciator off respectively on when the next
+UTC second starts.
 Unless terminated with a
 .Ql \&. ,
 the sequence is immediately repeated.