diff --git a/perception/lidar_apollo_instance_segmentation/schema/lidar_apollo_instance_segmentation.json b/perception/lidar_apollo_instance_segmentation/schema/lidar_apollo_instance_segmentation.json
index 50d5cce11e61d..4e6f35d9805c0 100644
--- a/perception/lidar_apollo_instance_segmentation/schema/lidar_apollo_instance_segmentation.json
+++ b/perception/lidar_apollo_instance_segmentation/schema/lidar_apollo_instance_segmentation.json
@@ -14,7 +14,7 @@
         "range": {
           "type": "number",
           "default": 60,
-          "description": "Half of the length of feature map sides. [m]."
+          "description": "Half of the length of feature map sides.[m]."
         },
         "width": {
           "type": "number",