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--- a/src/python/recoll/pyrclextract.cpp
+++ b/src/python/recoll/pyrclextract.cpp
@@ -150,7 +150,7 @@
 }
 
 PyDoc_STRVAR(doc_Extractor_idoctofile,
-"idoctofile(ipath)\n"
+"idoctofile(ipath='', mimetype='', ofilename='')\n"
 "Extract document defined by ipath into a file, in its native format.\n"
 );
 static PyObject *