@@ -643,6 +643,14 @@ guide](../articles/dockerfile_best-practices.md#build-cache) for more informatio

     2. The contents of the source tree, with conflicts resolved in favor

        of "2." on a file-by-file basis.

+  > **Note**:

+  > Whether a file is identified as a recognized compression format or not

+  > is done soley based on the contents of the file, not the name of the file.

+  > For example, if an empty file happens to end with `.tar.gz` this will not

+  > be recognized as a compressed file and **will not** generate any kind of

+  > decompression error message, rather the file will simply be copied to the

+  > destination.

+

 - If `<src>` is any other kind of file, it is copied individually along with

   its metadata. In this case, if `<dest>` ends with a trailing slash `/`, it

   will be considered a directory and the contents of `<src>` will be written