diff --git a/pypath/inputs/reactome/__init__.py b/pypath/inputs/reactome/__init__.py
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+++ b/pypath/inputs/reactome/__init__.py
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+# ChEBI2Reactome_PE_All_Levels: https://reactome.org/download/current/ChEBI2Reactome_PE_All_Levels.txt
+# pathway hierarchy: https://reactome.org/download/current/ReactomePathwaysRelation.txt
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