diff --git a/docs/source/_ext/show_on_colaboratory.py b/docs/source/_ext/show_on_colaboratory.py
index 712ce6c..966e05c 100644
--- a/docs/source/_ext/show_on_colaboratory.py
+++ b/docs/source/_ext/show_on_colaboratory.py
@@ -21,6 +21,9 @@ def get_colaboratory_url(path):
 
 
 def html_page_context(app, pagename, templatename, context, doctree):
+    if templatename != 'page.html':	
+        return
+
     path = os.path.relpath(doctree.get('source'), app.builder.srcdir).replace('notebook/', '')
     show_url = get_colaboratory_url(path)