--- a/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java
+++ b/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java
@@ -2017,16 +2017,23 @@ public final class BrowserDatabaseHelper
                 case 7:
                     upgradeDatabaseFrom6to7(db);
                     break;
 
                 case 8:
                     upgradeDatabaseFrom7to8(db);
                     break;
 
+                // 8->9 and 9->10 both dealt with dropping and recreating an obsolete VIEW_COMBINED_WITH_IMAGES,
+                // followed by completely dropping it again. This view was created in the 5->6 migration.
+                // Someone migrating from DB v8 or v9, to the latest DB, running this codebase, would
+                // would therefore presumably be left with an unused orphan VIEW_COMBINED_WITH_IMAGES.
+                // (Bug 947018 completely removed this code with the assumption that we no longer need to
+                // care because no users remained on those DB versions.)
+
                 case 11:
                     upgradeDatabaseFrom10to11(db);
                     break;
 
                 case 13:
                     upgradeDatabaseFrom12to13(db);
                     break;