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-rw-r--r--doc/mathop.n16
1 files changed, 11 insertions, 5 deletions
diff --git a/doc/mathop.n b/doc/mathop.n
index 5a6ba4e..5757f87 100644
--- a/doc/mathop.n
+++ b/doc/mathop.n
@@ -126,13 +126,19 @@ will be an integer.
.TP
\fB%\fR \fInumber number\fR
.
-Returns the integral modulus of the first argument with respect to the second.
-Each \fInumber\fR must have an integral value. Note that Tcl defines this
-operation exactly even for negative numbers, so that the following equality
-holds true:
+Returns the integral modulus (i.e., remainder) of the first argument
+with respect to the second.
+Each \fInumber\fR must have an integral value.
+Also, the sign of the result will be the same as the sign of the second
+\fInumber\fR, which must not be zero.
.RS
+.PP
+Note that Tcl defines this operation exactly even for negative numbers, so
+that the following command returns a true value (omitting the namespace for
+clarity):
+.PP
.CS
-(\fIx \fB/ \fIy\fR) \fB* \fIy \fB== \fIx \fB-\fR (\fIx \fB% \fIy\fR)
+\fB==\fR [\fB*\fR [\fB/\fI x y\fR] \fIy\fR] [\fB-\fI x\fR [\fB%\fI x y\fR]]
.CE
.RE
.TP