diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 36ecf26..298ae4e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,7 @@
 
 Changelog for readability
 ==========================
+- Sibling node is appended only when sibling doesn't already exist.
 - Treat images a little differently so they get more inclusion.
 - Added User-Agent string into HTTP requests.
 - Added property ``Article.main_text`` for getting text annotated with
diff --git a/readability/readable.py b/readability/readable.py
index e8f6bdd..ad5c02f 100644
--- a/readability/readable.py
+++ b/readability/readable.py
@@ -154,7 +154,8 @@ def check_siblings(candidate_node, candidate_list):
                 # filtered out later by accident.
                 sibling.tag = "div"
 
-            candidate_node.node.append(sibling)
+            if candidate_node.node != sibling:
+                candidate_node.node.append(sibling)
 
     return candidate_node