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diff --git a/README.md b/README.md
index 400abab..ddf32c7 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,7 @@ Example programs can be found [here](examples/).
 
 - [x] Lexer
 - [x] Abstract Syntax Tree
+- [ ] Preprocessor
 - [ ] Parser
 - [ ] Doer
 - [ ] ?? profit ??