diff --git a/changelog/5669.doc.rst b/changelog/5669.doc.rst
new file mode 100644
index 00000000000..0ec9626ae50
--- /dev/null
+++ b/changelog/5669.doc.rst
@@ -0,0 +1 @@
+Add docstring for ``Testdir.copy_example``.
diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
index 2068761faf9..29c200ce6dc 100644
--- a/src/_pytest/pytester.py
+++ b/src/_pytest/pytester.py
@@ -630,6 +630,12 @@ def mkpydir(self, name):
         return p
 
     def copy_example(self, name=None):
+        """Copy file from project's directory into the testdir.
+
+        :param str name: The name of the file for copy.
+        :return: path to the copied directory (inside ``self.tmpdir``).
+
+        """
         import warnings
         from _pytest.warning_types import PYTESTER_COPY_EXAMPLE