diff --git a/tests/org/eolang/bool-tests.eo b/tests/org/eolang/bool-tests.eo
index 2df2ab6a..2506f093 100644
--- a/tests/org/eolang/bool-tests.eo
+++ b/tests/org/eolang/bool-tests.eo
@@ -81,6 +81,7 @@
     01-.as-bytes.eq TRUE
     00-.as-bytes.eq FALSE
 
+# Test.
 [] > complex-bool-expression-in-while
   memory 0 > m
   seq > res