diff --git a/MVMCoreUI/Atomic/Protocols/MoleculeDelegateProtocol.swift b/MVMCoreUI/Atomic/Protocols/MoleculeDelegateProtocol.swift
index e7a4bdef..e8cae35b 100644
--- a/MVMCoreUI/Atomic/Protocols/MoleculeDelegateProtocol.swift
+++ b/MVMCoreUI/Atomic/Protocols/MoleculeDelegateProtocol.swift
@@ -22,7 +22,8 @@ public protocol MoleculeDelegateProtocol: AnyObject {
     /// Notifies the delegate that the molecule layout update. Should be called when the layout may change due to an async method. Mainly used for list or collections.
     func moleculeLayoutUpdated(_ molecule: MoleculeViewProtocol) //optional
     
-    func replaceMoleculeData(_ moleculeModels: [MoleculeModelProtocol])
+    /// Attempts to replace the molecules provided. Returns the ones that replaced successfully.
+    func replaceMoleculeData(_ moleculeModels: [MoleculeModelProtocol], completionHandler: (([MoleculeModelProtocol])->Void)?)
 }
 
 extension MoleculeDelegateProtocol {
diff --git a/MVMCoreUI/BaseControllers/ViewController.swift b/MVMCoreUI/BaseControllers/ViewController.swift
index 5997847d..452d2962 100644
--- a/MVMCoreUI/BaseControllers/ViewController.swift
+++ b/MVMCoreUI/BaseControllers/ViewController.swift
@@ -511,7 +511,7 @@ import MVMCore
     // Needed otherwise when subclassed, the extension gets called.
     open func moleculeLayoutUpdated(_ molecule: MoleculeViewProtocol) { }
     
-    public func replaceMoleculeData(_ moleculeModels: [MoleculeModelProtocol]) {
+    public func replaceMoleculeData(_ moleculeModels: [MoleculeModelProtocol], completionHandler: (([MoleculeModelProtocol])->Void)? = nil) {
         pageUpdateQueue.addOperation {
             let replacedModels:[MoleculeModelProtocol] = moleculeModels.compactMap { model in
                 guard self.attemptToReplace(with: model) else {
@@ -524,6 +524,7 @@ import MVMCore
                     self.updateUI(for: replacedModels)
                 }
             }
+            completionHandler?(replacedModels)
         }
     }
     
diff --git a/MVMCoreUI/Behaviors/ReplaceableMoleculeBehaviorModel.swift b/MVMCoreUI/Behaviors/ReplaceableMoleculeBehaviorModel.swift
index 2e38017c..e52ee464 100644
--- a/MVMCoreUI/Behaviors/ReplaceableMoleculeBehaviorModel.swift
+++ b/MVMCoreUI/Behaviors/ReplaceableMoleculeBehaviorModel.swift
@@ -62,7 +62,7 @@ public class ReplaceableMoleculeBehavior: PageMoleculeTransformationBehavior {
             }
         }
         if moleculeModels.count > 0 {
-            delegateObject?.moleculeDelegate?.replaceMoleculeData(moleculeModels)
+            delegateObject?.moleculeDelegate?.replaceMoleculeData(moleculeModels, completionHandler: nil)
         }
     }
     
@@ -95,8 +95,11 @@ public class ReplaceableMoleculeBehavior: PageMoleculeTransformationBehavior {
                 return nil
             }
         }
-        if modules.count > 0 {
-            delegateObject?.moleculeDelegate?.replaceMoleculeData(modules)
+        guard modules.count > 0 else { return }
+        delegateObject?.moleculeDelegate?.replaceMoleculeData(modules) { replacedModels in
+            let modules = replacedModels.compactMap { modulesLoaded.dictionaryForKey($0.id) }
+            guard let viewController = self.delegateObject?.moleculeDelegate as? MVMCoreViewControllerProtocol else { return }
+            modules.forEach { MVMCoreUILoggingHandler.shared()?.defaultLogPageUpdate(forController: viewController, from: $0) }
         }
     }
     
diff --git a/MVMCoreUI/OtherHandlers/MVMCoreUILoggingHandler.swift b/MVMCoreUI/OtherHandlers/MVMCoreUILoggingHandler.swift
index e74bc580..74a27f7f 100644
--- a/MVMCoreUI/OtherHandlers/MVMCoreUILoggingHandler.swift
+++ b/MVMCoreUI/OtherHandlers/MVMCoreUILoggingHandler.swift
@@ -13,4 +13,7 @@
 
     // Action Logging
     @objc open func defaultLogAction(forController controller: MVMCoreViewControllerProtocol?, actionInformation: [AnyHashable : Any]?, additionalData: [AnyHashable : Any]?) { }
+    
+    // Module Update Logging
+    @objc open func defaultLogPageUpdate(forController controller: MVMCoreViewControllerProtocol, from module: [AnyHashable: Any]) { }
 }