diff --git a/docs/openttd.6 b/docs/openttd.6
index 9160935f85..8acc6409f0 100644
--- a/docs/openttd.6
+++ b/docs/openttd.6
@@ -8,7 +8,6 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl efhx
-.Op Fl a Ar ai
 .Op Fl b Ar blitter
 .Op Fl c Ar config_file
 .Op Fl d Ar [level | cat=lvl[,...]]
@@ -30,10 +29,6 @@
 .Op Fl v Ar driver
 .Sh OPTIONS
 .Bl -tag -width ".Fl n Ar host[:port][#player]"
-.It Fl a Ar ai
-Set the AI, see
-.Fl h
-for a full list
 .It Fl b Ar blitter
 Set the blitter, see
 .Fl h
diff --git a/src/openttd.cpp b/src/openttd.cpp
index 66b0e05dac..641557b0da 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -161,7 +161,6 @@ static void ShowHelp()
 		"  -s drv              = Set sound driver (see below) (param bufsize,hz)\n"
 		"  -m drv              = Set music driver (see below)\n"
 		"  -b drv              = Set the blitter to use (see below)\n"
-		"  -a ai               = Force use of specific AI (see below)\n"
 		"  -r res              = Set resolution (for instance 800x600)\n"
 		"  -h                  = Display this help text\n"
 		"  -t year             = Set starting year\n"