Add -a option to synopsis.

diff --git a/advent.adoc b/advent.adoc
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--- a/advent.adoc
+++ b/advent.adoc
@@ -7,7 +7,7 @@
 advent - Colossal Cave Adventure
 
 == SYNOPSIS ==
-*advent* [-l logfile] [-o] [-r savefile] [script...]
+*advent* [-l logfile] [-o] [-r savefile] [-a savefile] [script...]
 
 == DESCRIPTION ==
 The original Colossal Cave Adventure from 1976-1977 was the origin of all