diff -r 38d225efcea9 -r b24de4b465ea docs/tutorial/mypandocfilters/raw-file.py
--- a/docs/tutorial/mypandocfilters/raw-file.py	Fri Nov 22 18:56:42 2019 +0100
+++ b/docs/tutorial/mypandocfilters/raw-file.py	Wed Dec 18 14:10:49 2019 +0100
@@ -16,8 +16,8 @@
         return pf.RawBlock('<pre>%s</pre>' % content, "html")
         # elem.text = content
 
-def main(doc=None):
-    return pf.run_filter(action, doc=doc)
+def main():
+    pf.toJSONFilter(action=action)
 
 
 if __name__ == '__main__':