diff --git a/doc/conf.py b/doc/conf.py
index e7976f59a87..891ed0eebed 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -198,6 +198,7 @@
     ('py:class', 'Path'),  # sphinx.application.Sphinx.connect
     ('py:class', 'RoleFunction'),  # sphinx.domains.Domain
     ('py:class', 'RSTState'),  # sphinx.utils.parsing.nested_parse_to_nodes
+    ('py:class', 'BaseRenderer'),  # sphinx.utils.fileutil.copy_asset_file
     ('py:class', 'Theme'),  # sphinx.application.TemplateBridge
     ('py:class', 'SearchLanguage'),  # sphinx.application.Sphinx.add_search_language
     ('py:class', 'StringList'),  # sphinx.utils.parsing.nested_parse_to_nodes
diff --git a/doc/extdev/utils.rst b/doc/extdev/utils.rst
index 9e10a0ded85..4eeec0394f1 100644
--- a/doc/extdev/utils.rst
+++ b/doc/extdev/utils.rst
@@ -44,6 +44,9 @@ Utility functions
 
 .. autofunction:: sphinx.util.parsing.nested_parse_to_nodes
 
+.. autofunction:: sphinx.util.fileutil.copy_asset_file
+
+.. autofunction:: sphinx.util.fileutil.copy_asset
 
 Utility types
 -------------
diff --git a/sphinx/util/fileutil.py b/sphinx/util/fileutil.py
index acd52b07674..3e4d5c7c567 100644
--- a/sphinx/util/fileutil.py
+++ b/sphinx/util/fileutil.py
@@ -53,6 +53,8 @@ def copy_asset_file(
     :param context: The template variables.  If not given, template files are simply copied
     :param renderer: The template engine.  If not given, SphinxRenderer is used by default
     :param bool force: Overwrite the destination file even if it exists.
+
+    .. versionadded:: 1.5
     """
     if not os.path.exists(source):
         return
@@ -115,7 +117,7 @@ def copy_asset(
     On copying, it expands the template variables if context argument is given and
     the asset is a template file.
 
-    Use ``copy_asset_file`` instead to copy a single file.
+    Use :func:`copy_asset_file` instead to copy a single file.
 
     :param source: The path to source file or directory
     :param destination: The path to destination directory
@@ -124,6 +126,8 @@ def copy_asset(
     :param renderer: The template engine.  If not given, SphinxRenderer is used by default
     :param onerror: The error handler.
     :param bool force: Overwrite the destination file even if it exists.
+
+    .. versionadded:: 1.5
     """
     if not os.path.exists(source):
         return