diff --git a/src/parse/terms.rs b/src/parse/terms.rs
index eb73a7b..1ff2580 100644
--- a/src/parse/terms.rs
+++ b/src/parse/terms.rs
@@ -579,6 +579,8 @@ mod tests
 		assert_eq!(format_term("(a % b) % (c * d)"), "a % b % (c * d)");
 		assert_eq!(format_term("(a % b) % (c / d)"), "a % b % (c / d)");
 		assert_eq!(format_term("(a % b) % (c % d)"), "a % b % (c % d)");
+
+		// TODO: test malformed expressions
 	}
 
 	#[test]