1 files changed, 4 insertions, 0 deletions

diff --git a/man/grab.1 b/man/grab.1
index 3521b9f..ab24337 100644
--- a/man/grab.1
+++ b/man/grab.1
@@ -234,6 +234,10 @@ letter,
 and highlights the capital letter(s):
 .Pp
 .Dl x/\ew+/ g/[A\-Z]/ h//
+.Pp
+The empty
+.Sq h
+operator is not permitted as the first operator in a pattern.
 .Sh ENVIRONMENT
 .Bl -tag -width GRAB_COLORS
 .It Ev GRAB_COLORS