diff --git a/doc/classes/Object.xml b/doc/classes/Object.xml
index b0dec2d00a55..eecb3ca525f5 100644
--- a/doc/classes/Object.xml
+++ b/doc/classes/Object.xml
@@ -693,6 +693,7 @@
 			<return type="int" />
 			<description>
 				Returns the object's unique instance ID. This ID can be saved in [EncodedObjectAsID], and can be used to retrieve this object instance with [method @GlobalScope.instance_from_id].
+				[b]Note:[/b] This ID is only useful during the current session. It won't correspond to a similar object if the ID is sent over a network, or loaded from a file at a later time.
 			</description>
 		</method>
 		<method name="get_meta" qualifiers="const">
diff --git a/doc/classes/RID.xml b/doc/classes/RID.xml
index 8fd93d00b906..323ac3b0ec2a 100644
--- a/doc/classes/RID.xml
+++ b/doc/classes/RID.xml
@@ -6,6 +6,7 @@
 	<description>
 		The RID [Variant] type is used to access a low-level resource by its unique ID. RIDs are opaque, which means they do not grant access to the resource by themselves. They are used by the low-level server classes, such as [DisplayServer], [RenderingServer], [TextServer], etc.
 		A low-level resource may correspond to a high-level [Resource], such as [Texture] or [Mesh].
+		[b]Note:[/b] RIDs are only useful during the current session. It won't correspond to a similar resource if sent over a network, or loaded from a file at a later time.
 	</description>
 	<tutorials>
 	</tutorials>