diff --git a/src/Gargantext/Config.purs b/src/Gargantext/Config.purs
index e20e6965836814026bb56a97badac165d8e414d3..ab57a5bbb30827f343afd14dcb0b002dd939dfc5 100644
--- a/src/Gargantext/Config.purs
+++ b/src/Gargantext/Config.purs
@@ -149,6 +149,8 @@ instance showNodeType :: Show NodeType where
   show Tree      = "tree"
   show Error     = "ErrorNodeType"
 
+-- | TODO : where is the Read Class ?
+-- instance readNodeType :: Read NodeType where
 readNodeType :: String -> NodeType
 readNodeType "NodeUser"   = NodeUser
 readNodeType "NodeCorpus" = Corpus