Typo, #150

Thanks to betelgeuse

man/rc-update.8

@@ -75,7 +75,7 @@ runlevels to show, then only those will be included in the output.
 Show all services.
 .It Fl u , -update
 Forces an update of the dependency tree cache.
-This may be needed in the even of clock skew (a file in /etc is newer than the
+This may be needed in the event of clock skew (a file in /etc is newer than the
 system clock).
 .El
 .Sh SEE ALSO