diff --git a/docs/api/en/objects/InstancedMesh.html b/docs/api/en/objects/InstancedMesh.html
index 76c92c9782a49b3f1b12821432ab9b0cfb9eef1a..ad1656038a84f26d1cef661c89890c0fd1352543 100644
--- a/docs/api/en/objects/InstancedMesh.html
+++ b/docs/api/en/objects/InstancedMesh.html
@@ -54,7 +54,8 @@
 
 		<h3>[property:BufferAttribute instanceMatrix]</h3>
 		<p>
-			Represents the local transformation of all instances. For internal use only.
+			Represents the local transformation of all instances.
+			You have to set its [page:BufferAttribute.needsUpdate needsUpdate] flag to true if you modify instanced data via [page:.setMatrixAt]().
 		</p>
 
 		<h2>Methods</h2>
diff --git a/docs/api/zh/objects/InstancedMesh.html b/docs/api/zh/objects/InstancedMesh.html
index 76c92c9782a49b3f1b12821432ab9b0cfb9eef1a..95f858089e4afe48d99f27c562bd51ce333709e4 100644
--- a/docs/api/zh/objects/InstancedMesh.html
+++ b/docs/api/zh/objects/InstancedMesh.html
@@ -54,9 +54,11 @@
 
 		<h3>[property:BufferAttribute instanceMatrix]</h3>
 		<p>
-			Represents the local transformation of all instances. For internal use only.
+			Represents the local transformation of all instances.
+			You have to set its [page:BufferAttribute.needsUpdate needsUpdate] flag to true if you modify instanced data via [page:.setMatrixAt]().
 		</p>
 
+
 		<h2>Methods</h2>
 		<p>See the base [page:Mesh] class for common methods.</p>