diff --git a/src/checker.cpp b/src/checker.cpp
index a6768d495..3e9b46407 100644
--- a/src/checker.cpp
+++ b/src/checker.cpp
@@ -3507,6 +3507,7 @@ gb_internal void check_decl_attributes(CheckerContext *c, Array<Ast *> const &at
 			if (!proc(c, elem, name, value, ac)) {
 				if (!build_context.ignore_unknown_attributes) {
 					error(elem, "Unknown attribute element name '%.*s'", LIT(name));
+					error_line("\tDid you forget to use build flag '-ignore-unknown-attributes'?\n");
 				}
 			}
 		}