diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2905,6 +2905,8 @@
                 uiInterface.NotifyBlockTip(fInitialDownload, pindexNewTip);
             }
         }
+        // When we reach this point, we switched to a new tip (stored in
+        // pindexNewTip).
 
         if (nStopAtHeight && pindexNewTip &&
             pindexNewTip->nHeight >= nStopAtHeight) {
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -169,6 +169,11 @@
 void CMainSignals::UpdatedBlockTip(const CBlockIndex *pindexNew,
                                    const CBlockIndex *pindexFork,
                                    bool fInitialDownload) {
+    // Dependencies exist that require UpdatedBlockTip events to be delivered in
+    // the order in which the chain actually updates. One way to ensure this is
+    // for the caller to invoke this signal in the same critical section where
+    // the chain is updated
+
     m_internals->m_schedulerClient.AddToProcessQueue([pindexNew, pindexFork,
                                                       fInitialDownload, this] {
         m_internals->UpdatedBlockTip(pindexNew, pindexFork, fInitialDownload);