diff --git a/types.txt b/types.txt
new file mode 100644
index 0000000000..c48ef1d0ff
--- /dev/null
+++ b/types.txt
@@ -0,0 +1,10 @@
+L Size
+B Boolean
+P ConstStr255Param
+W CharParameter
+W OSErr
+W UInt16
+L UInt32
+P KeyMap
+W EventKind
+W EventMask