diff --git a/lark/grammars/unicode.lark b/lark/grammars/unicode.lark
new file mode 100644
index 0000000..0ab849e
--- /dev/null
+++ b/lark/grammars/unicode.lark
@@ -0,0 +1,7 @@
+// TODO: LETTER, WORD, etc.
+
+//
+// Whitespace
+//
+WS_INLINE: /[ \t\xa0]/+
+WS: /[ \t\xa0\f\r\n]/+