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-rw-r--r--manual/signal.texi7
1 files changed, 5 insertions, 2 deletions
diff --git a/manual/signal.texi b/manual/signal.texi
index 903062f3c6..2c06c6ca2d 100644
--- a/manual/signal.texi
+++ b/manual/signal.texi
@@ -2564,8 +2564,11 @@ The prototype for the @code{sigprocmask} function is in @file{signal.h}.
 Note that you must not use @code{sigprocmask} in multi-threaded processes,
 because each thread has its own signal mask and there is no single process
 signal mask. According to POSIX, the behavior of @code{sigprocmask} in a
-multi-threaded process is ``unspeficied''. Instead, use 
-@code{pthread_sigmask} (@pxref{Threads and Signal Handling}).
+multi-threaded process is ``unspeficied''.
+Instead, use @code{pthread_sigmask}.
+@ifset linuxthreads
+@xref{Threads and Signal Handling}.
+@end ifset
 
 @comment signal.h
 @comment POSIX.1