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-rw-r--r--pod/perlport.pod6
1 files changed, 6 insertions, 0 deletions
diff --git a/pod/perlport.pod b/pod/perlport.pod
index ac260ed8f3..791c90d695 100644
--- a/pod/perlport.pod
+++ b/pod/perlport.pod
@@ -1517,6 +1517,12 @@ suffixes. C<-S> is meaningless. (Win32)
C<-x> (or C<-X>) determine if a file has an executable file type.
(S<RISC OS>)
+=item alarm
+
+Emulated using timers that must be explicitly polled whenever Perl
+wants to dispatch "safe signals" and therefore cannot interrupt
+blocking system calls. (Win32)
+
=item atan2
Due to issues with various CPUs, math libraries, compilers, and standards,