diff --git a/skimage/graph/rag.py b/skimage/graph/rag.py
index 807e8cd3..17c8cab8 100644
--- a/skimage/graph/rag.py
+++ b/skimage/graph/rag.py
@@ -56,8 +56,8 @@ class RAG(nx.Graph):
             Function to decide edge weight of edges incident on the new node.
             For each neighbor `n` for `src and `dst`, `weight_func` will be
             called as follows: `weight_func(src, dst, n, *extra_arguments,
-            **extra_keywords)`. `src`, `dst` and `n` are IDs of vertices in a
-            .. py:class:: RAG object which is in turn a subclass of
+            **extra_keywords)`. `src`, `dst` and `n` are IDs of vertices in the
+            RAG object which is in turn a subclass of
             `networkx.Graph`.
         extra_arguments : sequence, optional
             The sequence of extra positional arguments passed to