--- Libc/Libc-262/sys/sigwait.2
+++ Libc/Libc-320/sys/sigwait.2
@@ -53,8 +53,14 @@
 .Pp
 The signals specified by
 .Fa set
-should be blocked at the time of the call to
+should be blocked, but not ignored, at the time of the call to
 .Fn sigwait .
+.Pp
+Processes which call 
+.Fn sigwait
+on ignored signals will wait indefinately.  Ignored 
+signals are dropped immeadiately by the system, before delivery 
+to a waiting process.
 .Sh RETURN VALUES
 If successful,
 .Fn sigwait
@@ -79,4 +85,3 @@
 .Sh STANDARDS
 .Fn sigwait
 conforms to ISO/IEC 9945-1:1996 (``POSIX.1'')
-