diff --git a/models/workflow/workflow.go b/models/workflow/workflow.go
index 49f99ad..880d720 100644
--- a/models/workflow/workflow.go
+++ b/models/workflow/workflow.go
@@ -227,6 +227,10 @@ func (wf *Workflow) Planify(start time.Time, end *time.Time, request *tools.APIR
 	return longest, priceds, wf, nil
 }
 
+// Returns a map of DataType (processing,computing,data,storage,worfklow) where each resource (identified by its UUID) 
+// is mapped to the list of its items (different appearance) in the graph
+// ex: if the same Minio storage is represented by several nodes in the graph, in [tools.STORAGE_RESSOURCE] its UUID will be mapped to
+// the list of GraphItem ID that correspond to the ID of each node   
 func (w *Workflow) GetItemsByResources() (map[tools.DataType]map[string][]string) {
 	res := make(map[tools.DataType]map[string][]string)
 	dtMethodMap := map[tools.DataType]func() []graph.GraphItem{