--- a/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java
+++ b/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java
@@ -1167,16 +1167,18 @@ public final class BrowserDatabaseHelper
                 case 25:
                     upgradeDatabaseFrom24to25(db);
                     break;
 
                 case 26:
                     upgradeDatabaseFrom25to26(db);
                     break;
 
+                // case 27 occurs in UrlMetadataTable.onUpgrade
+
                 case 28:
                     upgradeDatabaseFrom27to28(db);
                     break;
 
                 case 29:
                     upgradeDatabaseFrom28to29(db);
             }
         }