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-rw-r--r--man/groff.man12
1 files changed, 10 insertions, 2 deletions
diff --git a/man/groff.man b/man/groff.man
index 35c0bd9c..c89dcfdd 100644
--- a/man/groff.man
+++ b/man/groff.man
@@ -884,7 +884,7 @@ yields true if its value is greater than\~0.
.BI ! N
True if the value of
.I I
-is\~0.
+is\~0 (see below).
.
.TPx
.BI \[aq] s1 \[aq] s2 \[aq]
@@ -898,7 +898,8 @@ is identical to string\~\c
True if string\~\c
.I s1
is not identical to string\~\c
-.IR s2 .
+.I s2
+(see below).
.
.TPx
.BI c ch
@@ -952,6 +953,13 @@ has been registered.
.
.RE
.PD
+.P
+Note that the
+.B !
+operator may only appear at the beginning of an expression,
+and negates the entire expression.
+This maintains bug-compatibility with AT&T
+.IR troff .
.
.
.\" --------------------------------------------------------------------