diff --git a/Doc-26/ACKS b/Doc-26/ACKS.txt
similarity index 100%
rename from Doc-26/ACKS
rename to Doc-26/ACKS.txt
diff --git a/Doc-26/TODO b/Doc-26/TODO.txt
similarity index 100%
rename from Doc-26/TODO
rename to Doc-26/TODO.txt
diff --git a/Doc-26/about.rst b/Doc-26/about.rst
index 1f32f97ed..d3ce2dd0a 100644
--- a/Doc-26/about.rst
+++ b/Doc-26/about.rst
@@ -27,7 +27,7 @@ Many thanks go to:
 See :ref:`reporting-bugs` for information how to report bugs in Python itself.
 
 .. including the ACKS file here so that it can be maintained separately
-.. include:: ACKS
+.. include:: ACKS.txt
 
 It is only with the input and contributions of the Python community
 that Python has such wonderful documentation -- Thank You!
diff --git a/Doc-3k/ACKS b/Doc-3k/ACKS.txt
similarity index 100%
rename from Doc-3k/ACKS
rename to Doc-3k/ACKS.txt
diff --git a/Doc-3k/TODO b/Doc-3k/TODO.txt
similarity index 100%
rename from Doc-3k/TODO
rename to Doc-3k/TODO.txt
diff --git a/Doc-3k/about.rst b/Doc-3k/about.rst
index 1f32f97ed..d3ce2dd0a 100644
--- a/Doc-3k/about.rst
+++ b/Doc-3k/about.rst
@@ -27,7 +27,7 @@ Many thanks go to:
 See :ref:`reporting-bugs` for information how to report bugs in Python itself.
 
 .. including the ACKS file here so that it can be maintained separately
-.. include:: ACKS
+.. include:: ACKS.txt
 
 It is only with the input and contributions of the Python community
 that Python has such wonderful documentation -- Thank You!