diff --git a/Doc/lib/libsignal.tex b/Doc/lib/libsignal.tex
index f168b6d..cfdb4dd 100644
--- a/Doc/lib/libsignal.tex
+++ b/Doc/lib/libsignal.tex
@@ -100,7 +100,7 @@
   Any previously scheduled alarm is canceled (only one alarm can
   be scheduled at any time).  The returned value is then the number of
   seconds before any previously set alarm was to have been delivered.
-  If \var{time} is zero, no alarm id scheduled, and any scheduled
+  If \var{time} is zero, no alarm is scheduled, and any scheduled
   alarm is canceled.  The return value is the number of seconds
   remaining before a previously scheduled alarm.  If the return value
   is zero, no alarm is currently scheduled.  (See the \UNIX{} man page