diff --git a/src/newgrf_config.h b/src/newgrf_config.h
--- a/src/newgrf_config.h
+++ b/src/newgrf_config.h
@@ -175,6 +175,7 @@ struct GRFConfig : ZeroedMemoryAllocator
 
 	bool IsOpenTTDBaseGRF() const;
 
+	const char *GetReadme() const;
 	const char *GetName() const;
 	const char *GetDescription() const;