diff --git a/docs/design/passive_sonar/passive_sonar.rst b/docs/design/passive_sonar/passive_sonar.rst
index 590a7010c..6f23f38ab 100644
--- a/docs/design/passive_sonar/passive_sonar.rst
+++ b/docs/design/passive_sonar/passive_sonar.rst
@@ -79,7 +79,7 @@ Configuration
 All parameters that are expected to be changed in tuining are ROS Params initialized in ``passive_sonar.yaml``
 
 To make a custom configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 * ``roscd subjugator_launch``