diff --git a/OpenSSL/test/test_crypto.py b/OpenSSL/test/test_crypto.py
index c6ed6c0..60f9e6a 100644
--- a/OpenSSL/test/test_crypto.py
+++ b/OpenSSL/test/test_crypto.py
@@ -2593,6 +2593,10 @@
 
 
     def test_load_pkcs7_data_asn1(self):
+        """
+        :py:obj:`load_pkcs7_data` accepts a bytes containing ASN1 data
+        representing PKCS#7 and returns an instance of :py:obj`PKCS7Type`.
+        """
         pkcs7 = load_pkcs7_data(FILETYPE_ASN1, pkcs7DataASN1)
         self.assertTrue(isinstance(pkcs7, PKCS7Type))