diff --git a/CHANGES b/CHANGES
index 9e8bc1151e7..331f14d81ab 100644
--- a/CHANGES
+++ b/CHANGES
@@ -13,6 +13,9 @@ Deprecated
 Features added
 --------------
 
+* #9623: Allow to suppress "toctree contains reference to excluded document"
+  warnings using :confval:`suppress_warnings`
+
 Bugs fixed
 ----------
 
diff --git a/doc/usage/configuration.rst b/doc/usage/configuration.rst
index a6607e57eb9..dba3cc83128 100644
--- a/doc/usage/configuration.rst
+++ b/doc/usage/configuration.rst
@@ -329,6 +329,7 @@ General configuration
    * ``ref.python``
    * ``misc.highlighting_failure``
    * ``toc.circular``
+   * ``toc.not_readable``
    * ``toc.secnum``
    * ``epub.unknown_project_files``
    * ``epub.duplicated_toc_entry``
diff --git a/sphinx/directives/other.py b/sphinx/directives/other.py
index 1847a72cd47..1afb39a53fc 100644
--- a/sphinx/directives/other.py
+++ b/sphinx/directives/other.py
@@ -133,7 +133,8 @@ def parse_content(self, toctree: addnodes.toctree) -> List[Node]:
                     else:
                         message = __('toctree contains reference to nonexisting document %r')
 
-                    logger.warning(message, docname, location=toctree)
+                    logger.warning(message, docname, type='toc', subtype='not_readable',
+                                   location=toctree)
                     self.env.note_reread()
                 else:
                     if docname in all_docnames: