diff --git a/compiler/ast.jou b/compiler/ast.jou
index 57c9da08..ba27104b 100644
--- a/compiler/ast.jou
+++ b/compiler/ast.jou
@@ -1,8 +1,8 @@
 # This file defines data structures of the Abstract Syntax Tree. They are
 # constructed in parser.jou.
 #
-# Many class in this file have .print(), which can be used during debugging. If
-# .print() exists, you probably don't want to use .print_with_tree_printer(),
+# Many classes in this file have .print(), which can be used during debugging. If
+# .print() exists, you probably don't need to call .print_with_tree_printer(),
 # which is basically an internal detail of the .print() implementation.
 
 import "stdlib/io.jou"