diff --git a/Structure-of-the-code.md b/Structure-of-the-code.md
index c487df9..852314e 100644
--- a/Structure-of-the-code.md
+++ b/Structure-of-the-code.md
@@ -21,8 +21,8 @@ The package code is organized in osxphotos per the table below. Most of the file
 |`albuminfo.py`|             AlbumInfo and FolderInfo classes|
 |`datetime_formatter.py`|    utility methods for formatting datetime objects|
 |`exiftool.py`|              ExifTool class|
-|`photoinfo.py`|             PhotoInfo class|
-|`photosdb.py`|              PhotosDB class |
+|`photoinfo`|             PhotoInfo class and associated mixin classes|
+|`photosdb`|              PhotosDB class and associated mixin classes|
 |`placeinfo.py`|             PlaceInfo class|
 |`template.py`|              constants used by the PhotoInfo.render_template() method|
 |`templates`|                contains [mako](https://www.makotemplates.org/) templates for sidecar export (though the name is similar, these templates are not associated with `templates.py`|