diff --git a/edm4eic.yaml b/edm4eic.yaml
index 13b70f2..6d11477 100644
--- a/edm4eic.yaml
+++ b/edm4eic.yaml
@@ -248,6 +248,8 @@ datatypes:
       - int32_t           sector            // Sector that this hit occurred in
       - int32_t           layer             // Layer that the hit occurred in
       - edm4hep::Vector3f local             // The local coordinates of the hit in the detector segment [mm]. 
+    OneToOneRelations:
+      - edm4hep::RawCalorimeterHit rawHit   // Related raw calorimeter hit
 
   ## ==========================================================================
   ## Clustering
@@ -356,7 +358,9 @@ datatypes:
       - float             timeError         // Error on the time
       - float             edep              // Energy deposit in this hit [GeV]
       - float             edepError         // Error on the energy deposit [GeV]
-
+    OneToOneRelations:
+      - edm4eic::RawTrackerHit rawHit       // Related raw tracker hit
+      
   edm4eic::Measurement2D:
     Description: "2D measurement (on an arbitrary surface)"
     Author: "W. Deconinck"
@@ -545,5 +549,14 @@ datatypes:
     Members:
       - float                 weight        // weight of this association
     OneToOneRelations:
-     - edm4eic::RawTrackerHit rawHit        // reference to the digitized hit
-     - edm4hep::SimTrackerHit simHit       // reference to the simulated hit
+      - edm4eic::RawTrackerHit rawHit       // reference to the digitized hit
+      - edm4hep::SimTrackerHit simHit       // reference to the simulated hit
+
+  edm4eic::MCRecoCalorimeterHitAssociation:
+    Description: "Association between a RawCalorimeterHit and a SimCalorimeterHit"
+    Author: "S. Rahman"
+    Members:
+      - float                 weight        // weight of this association
+    OneToOneRelations:
+      - edm4hep::RawCalorimeterHit rawHit   // reference to the digitized calorimeter hit
+      - edm4hep::SimCalorimeterHit simHit   // reference to the simulated calorimeter hit