diff --git a/misc-scripts/ontology/README b/misc-scripts/ontology/README
index 8a50311fd947440786283e1bad20a30bb28fce11..e44ca3bdcc7ca49c6bf253c5349dfc82253174ef 100644
--- a/misc-scripts/ontology/README
+++ b/misc-scripts/ontology/README
@@ -148,7 +148,7 @@
 
     3.  Fetching a structure that encodes the ancestor relationships of
         a term.
-        $adaptor->_fetch_ancestor_chart()
+        $adaptor->_fetch_ancestor_chart($term)
 
     Given  an  ontology  term,  which  is  a  Bio::EnsEMBL::OntologyTerm
     object, some operations from the  second set of operations above are