diff --git a/website/raw/docs/tut/intro.mkdown b/website/raw/docs/tut/intro.mkdown
index e901edb722628301b97af0ca61a5332cfecb7c8b..402c195a26dd3d8c1468f2bc03f14a1a9b9e444b 100644
--- a/website/raw/docs/tut/intro.mkdown
+++ b/website/raw/docs/tut/intro.mkdown
@@ -182,5 +182,5 @@ Type
 to save the full view. To save only the backbone atoms, we can first select the backbone atoms and then save it:
 
      ::::python
-     io.SavePDB(fragment.Select('aname=CA,C,N,O), 'backbone.pdb')
+     io.SavePDB(fragment.Select('aname=CA,C,N,O'), 'backbone.pdb')