diff --git a/examples/distillation/dataset.py b/examples/distillation/dataset.py
index b3b76fd83cb..cdc16b94f34 100644
--- a/examples/distillation/dataset.py
+++ b/examples/distillation/dataset.py
@@ -1,5 +1,5 @@
 # coding=utf-8
-# Copyright 2019-present, the HuggingFace Inc. team.
+# Copyright 2019-present, the HuggingFace Inc. team and Facebook, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,8 +12,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-"""
-Dataloaders to train DistilBERT.
+""" Dataloaders to train DistilBERT
+    adapted in part from Facebook, Inc XLM model (https://github.com/facebookresearch/XLM)
 """
 from typing import List
 import math
diff --git a/examples/distillation/distiller.py b/examples/distillation/distiller.py
index e6c27fe365c..38769c4b0ec 100644
--- a/examples/distillation/distiller.py
+++ b/examples/distillation/distiller.py
@@ -1,5 +1,5 @@
 # coding=utf-8
-# Copyright 2019-present, the HuggingFace Inc. team.
+# Copyright 2019-present, the HuggingFace Inc. team and Facebook, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,8 +12,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-"""
-The distiller to distil DistilBERT.
+""" The distiller to distil DistilBERT
+    adapted in part from Facebook, Inc XLM model (https://github.com/facebookresearch/XLM)
 """
 import os
 import math
diff --git a/examples/distillation/utils.py b/examples/distillation/utils.py
index 461c371898e..3d625047108 100644
--- a/examples/distillation/utils.py
+++ b/examples/distillation/utils.py
@@ -1,5 +1,5 @@
 # coding=utf-8
-# Copyright 2019-present, the HuggingFace Inc. team.
+# Copyright 2019-present, the HuggingFace Inc. team and Facebook, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,8 +12,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-"""
-Utils to train DistilBERT.
+""" Utils to train DistilBERT
+    adapted in part from Facebook, Inc XLM model (https://github.com/facebookresearch/XLM)
 """
 import git
 import json
diff --git a/pytorch_transformers/modeling_distilbert.py b/pytorch_transformers/modeling_distilbert.py
index 63a7485683d..8ec984199a9 100644
--- a/pytorch_transformers/modeling_distilbert.py
+++ b/pytorch_transformers/modeling_distilbert.py
@@ -1,5 +1,5 @@
 # coding=utf-8
-# Copyright 2019-present, the HuggingFace Inc. team and Facebook, Inc.
+# Copyright 2019-present, the HuggingFace Inc. team, The Google AI Language Team and Facebook, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,8 +12,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-"""
-PyTorch DistilBERT model.
+""" PyTorch DistilBERT model
+    adapted in part from Facebook, Inc XLM model (https://github.com/facebookresearch/XLM)
+    and in part from HuggingFace PyTorch version of Google AI Bert model (https://github.com/google-research/bert)
 """
 from __future__ import absolute_import, division, print_function, unicode_literals