correct heading level
diff --git a/src/spec/doc/core-syntax.adoc b/src/spec/doc/core-syntax.adoc
index c1a67c8..6ee0790 100644
--- a/src/spec/doc/core-syntax.adoc
+++ b/src/spec/doc/core-syntax.adoc
@@ -1102,7 +1102,7 @@
Java's array initializer notation is not supported by Groovy,
as the curly braces can be misinterpreted with the notation of Groovy closures.
-==== Java-style array initialization
+=== Java-style array initialization
Groovy has always supported literal list/array definitions using square brackets
and has avoided Java-style curly braces so as not to conflict with closure definitions.
