diff --git a/Makefile b/Makefile
index 54f4ab5..b5a2921 100644
--- a/Makefile
+++ b/Makefile
@@ -19,3 +19,10 @@ $(PDF_DIR)/%.pdf: $(NOTES_DIR)/%.md pdf_dir
 
 pdf_dir:
 	mkdir -p $(PDF_DIR)
+
+.PHONY: clean
+
+clean: clean_pdf
+
+clean_pdf:
+	rm -rf $(PDF_DIR)