diff --git a/docs/design/autoware-architecture/perception/reference-implementations/radar-based-3d-detector/radar-based-3d-detector.md b/docs/design/autoware-architecture/perception/reference-implementations/radar-based-3d-detector/radar-based-3d-detector.md
index be521f4976b..e8992a05553 100644
--- a/docs/design/autoware-architecture/perception/reference-implementations/radar-based-3d-detector/radar-based-3d-detector.md
+++ b/docs/design/autoware-architecture/perception/reference-implementations/radar-based-3d-detector/radar-based-3d-detector.md
@@ -4,7 +4,7 @@
 
 ### Features
 
-Radar based 3D detector aims for the following.
+Radar based 3D detector aims for the following:
 
 - Detecting objects farther than the range of LiDAR-based 3D detection.