diff --git a/docs/src/userguide/memoryviews.rst b/docs/src/userguide/memoryviews.rst
index 8d40e2ea44c673fa4e19094907647b6d1fb07b14..06f754bd7c337335b5f7c4d2505fa039ba9c5940 100644
--- a/docs/src/userguide/memoryviews.rst
+++ b/docs/src/userguide/memoryviews.rst
@@ -60,7 +60,7 @@ They also work conveniently as function arguments:
 
 .. code-block:: cython
 
-    def process_3d_buffer(int[:,:] view not None):
+    def process_3d_buffer(int[:,:,:] view not None):
         ...
 
 The ``not None`` declaration for the argument automatically rejects