diff --git a/core/syntax/arity/arity.factor b/core/syntax/arity/arity.factor
index 140f89fe22..adc3e05798 100644
--- a/core/syntax/arity/arity.factor
+++ b/core/syntax/arity/arity.factor
@@ -1,7 +1,7 @@
 ! Copyright (C) 2016 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: ;
-in: syntax.arity
+IN: syntax.arity
 
 ARITY: \ IN: 1
 ARITY: \ USE: 1
@@ -9,9 +9,11 @@ ARITY: \ UNUSE: 1
 ARITY: \ SYMBOL: 1
 ARITY: \ SINGLETON: 1
 ARITY: \ B: 1
+ARITY: \ MAIN: 1
 
 
 ARITY: \ ALIAS: 2
+ARITY: \ ARITY: 2
 ARITY: \ C: 2
 ARITY: \ CONSTANT: 2
 ARITY: \ INSTANCE: 2