diff --git a/source/reference/object-id.txt b/source/reference/object-id.txt
index 53294f7ac27..633a8a5ab9d 100644
--- a/source/reference/object-id.txt
+++ b/source/reference/object-id.txt
@@ -30,9 +30,16 @@ additional benefits:
   <ObjectId.getTimestamp()>` method.
 
 - sorting on an ``_id`` field that stores ``ObjectId`` values is
-  roughly equivalent to sorting by creation time, although this
-  relationship is not strict with ``ObjectId`` values generated on
-  multiple systems within a single second.
+  roughly equivalent to sorting by creation time.
+
+    .. warning::
+
+        This relationship is not strict with ``ObjectId`` values 
+        generated within a single second. This can happen if the 
+        values are generated by multiple systems within a second,
+        or as a result of clock skew on the client side, which
+        would result in non-strict behavior even for entries that 
+        are multiple seconds apart.
 
 Also consider the :doc:`/core/document/` section for related
 information on MongoDB's document orientation.