diff --git a/source/elements/oneTBB/source/algorithms/blocked_ranges/blocked_nd_range_cls.rst b/source/elements/oneTBB/source/algorithms/blocked_ranges/blocked_nd_range_cls.rst
index 2e44a203e..1e618fc74 100644
--- a/source/elements/oneTBB/source/algorithms/blocked_ranges/blocked_nd_range_cls.rst
+++ b/source/elements/oneTBB/source/algorithms/blocked_ranges/blocked_nd_range_cls.rst
@@ -3,9 +3,9 @@
 ..
 .. SPDX-License-Identifier: CC-BY-4.0
 
-===============
+================
 blocked_nd_range
-===============
+================
 **[algorithms.blocked_nd_range]**
 
 Class template that represents a recursively divisible N-dimensional half-open interval.