diff --git a/src/qt/addresstablemodel.cpp b/src/qt/addresstablemodel.cpp
index 03517c657..ef8a001f3 100644
--- a/src/qt/addresstablemodel.cpp
+++ b/src/qt/addresstablemodel.cpp
@@ -80,6 +80,8 @@ public:
             }
         }
         // qLowerBound() and qUpperBound() require our cachedAddressTable list to be sorted in asc order
+        // Even though the map is already sorted this re-sorting step is needed because the originating map
+        // is sorted by binary address, not by base58() address.
         qSort(cachedAddressTable.begin(), cachedAddressTable.end(), AddressTableEntryLessThan());
     }