Index: share/man/man9/style.9
===================================================================
--- share/man/man9/style.9
+++ share/man/man9/style.9
@@ -25,7 +25,7 @@
 .\"	From: @(#)style	1.14 (Berkeley) 4/28/95
 .\" $FreeBSD$
 .\"
-.Dd October 28, 2020
+.Dd May 27, 2021
 .Dt STYLE 9
 .Os
 .Sh NAME
@@ -756,9 +756,10 @@
 !(p = f())
 .Ed
 .Pp
-Do not use
-.Ic \&!
-for tests unless it is a boolean, e.g., use:
+Do not test without a comparison, or with unary
+.Ic \&! 
+(except for booleans).
+For example, use:
 .Bd -literal
 if (*p == '\e0')
 .Ed
@@ -768,6 +769,16 @@
 if (!*p)
 .Ed
 .Pp
+Prefer:
+.Bd -literal
+if (count != 0)
+.Ed
+.Pp
+over:
+.Bd -literal
+if (count)
+.Ed
+.Pp
 Routines returning
 .Vt "void *"
 should not have their return values cast