diff --git a/src/sage/combinat/designs/database.py b/src/sage/combinat/designs/database.py
index 4ec5f812654..1b8c73e3cc7 100644
--- a/src/sage/combinat/designs/database.py
+++ b/src/sage/combinat/designs/database.py
@@ -2484,14 +2484,6 @@ def OA_11_185():
 
         sage: designs.orthogonal_array(11,185,existence=True)
         True
-
-    REFERENCE:
-
-    .. [Greig99] Designs from projective planes and PBD bases,
-      Malcolm Greig,
-      Journal of Combinatorial Designs,
-      Volume 7, Issue 5, pages 341–374, 1999
-
     """
     from sage.combinat.designs.difference_family import difference_family