Add REPL history
diff --git a/Repl.h b/Repl.h
index a4939d3..b3470f2 100644
--- a/Repl.h
+++ b/Repl.h
@@ -16,6 +16,7 @@
 
 protected:
 	QString readLine();
+	void addHistory(QString line);
 	bool trySpecialCase(QString line);
 	bool tryEvaluate(QString line, QList<AstNode> *expr);