diff --git a/docs/source/config_reference/plugins.rst b/docs/source/config_reference/plugins.rst
index 5ed98611..95c636e8 100644
--- a/docs/source/config_reference/plugins.rst
+++ b/docs/source/config_reference/plugins.rst
@@ -841,13 +841,6 @@ for representing audio albums.
 
    square_thumbnail: True
 
-``format_string``
-
-Returns
--------
-The literal format string, unformatted.
-
-
 ----------------------------------------------------------------------------------------------------
 
 static_nfo_tags
diff --git a/tools/docgen/plugins.py b/tools/docgen/plugins.py
index 8080c297..e42718ad 100644
--- a/tools/docgen/plugins.py
+++ b/tools/docgen/plugins.py
@@ -25,6 +25,7 @@ def should_filter_all_properties(plugin_name: str) -> bool:
         "filter_include",
         "filter_exclude",
         "embed_thumbnail",
+        "square_thumbnail",
         "video_tags",
         "download",
     )