Added ERANGE error

diff --git a/man3/log2.3 b/man3/log2.3
index 035b6c8f8a6dd23cbabd74bd3c2ef701b2381861..efd7e099aebc91acf9a6ef23061fdb8311f767a9 100644 (file)
--- a/man3/log2.3
+++ b/man3/log2.3
@@ -51,6 +51,10 @@ The \fBlog2()\fP function can return the following error:
 .TP
 .B EDOM
 The argument \fIx\fP is negative.
+.TP
+.B ERANGE
+The argument \fIx\fP is zero.  The log of zero is not defined
+(minus infinity).
 .SH "CONFORMING TO"
 SVID 3, POSIX, BSD 4.3, ISO 9899.
 The float and the long double variants are C99 requirements.