diff --git a/planning/behavior_path_avoidance_module/include/behavior_path_avoidance_module/parameter_helper.hpp b/planning/behavior_path_avoidance_module/include/behavior_path_avoidance_module/parameter_helper.hpp
index e115e676b1dbf..25101537850ae 100644
--- a/planning/behavior_path_avoidance_module/include/behavior_path_avoidance_module/parameter_helper.hpp
+++ b/planning/behavior_path_avoidance_module/include/behavior_path_avoidance_module/parameter_helper.hpp
@@ -131,6 +131,11 @@ AvoidanceParameters getParameter(rclcpp::Node * node)
       getOrDeclareParameter<double>(*node, ns + "min_road_shoulder_width");
   }
 
+  {
+    const std::string ns = "avoidance.target_filtering.merging_vehicle.";
+    p.th_overhang_distance = getOrDeclareParameter<double>(*node, ns + "th_overhang_distance");
+  }
+
   {
     const std::string ns = "avoidance.target_filtering.avoidance_for_ambiguous_vehicle.";
     p.enable_avoidance_for_ambiguous_vehicle = getOrDeclareParameter<bool>(*node, ns + "enable");
diff --git a/planning/behavior_path_avoidance_module/schema/avoidance.schema.json b/planning/behavior_path_avoidance_module/schema/avoidance.schema.json
index 91f9519596bb1..7c0205d2473e5 100644
--- a/planning/behavior_path_avoidance_module/schema/avoidance.schema.json
+++ b/planning/behavior_path_avoidance_module/schema/avoidance.schema.json
@@ -686,7 +686,7 @@
               "properties": {
                 "th_overhang_distance": {
                   "type": "number",
-                  "description": "Distance threshold between overhang point and ego lane's centerline. If the nearest overhang point of merging/deviating vehicle is less than this param, the module never avoid it. (Basically, the ego stops behind of it.)",
+                  "description": "Distance threshold to ignore merging/deviating vehicle to/from ego driving lane. The distance represents how the object polygon overlaps ego lane, and it's calculated from polygon overhang point and lane centerline. If the distance is more than this param, the module never avoid the object. (Basically, the ego stops behind of it.)",
                   "default": 0.5
                 }
               },
diff --git a/planning/behavior_path_avoidance_module/src/manager.cpp b/planning/behavior_path_avoidance_module/src/manager.cpp
index dbff6f60365f3..7772bd9c2ad35 100644
--- a/planning/behavior_path_avoidance_module/src/manager.cpp
+++ b/planning/behavior_path_avoidance_module/src/manager.cpp
@@ -124,6 +124,11 @@ void AvoidanceModuleManager::updateModuleParams(const std::vector<rclcpp::Parame
     updateParam<double>(parameters, ns + "backward_distance", p->object_check_backward_distance);
   }
 
+  {
+    const std::string ns = "avoidance.target_filtering.merging_vehicle.";
+    updateParam<double>(parameters, ns + "th_overhang_distance", p->th_overhang_distance);
+  }
+
   {
     const std::string ns = "avoidance.avoidance.lateral.avoidance_for_ambiguous_vehicle.";
     updateParam<bool>(parameters, ns + "enable", p->enable_avoidance_for_ambiguous_vehicle);