diff --git a/Ja2.ini b/Ja2.ini
index f82cd1d69..0546d9bc6 100644
--- a/Ja2.ini
+++ b/Ja2.ini
@@ -30,8 +30,12 @@ VFS_CONFIG_INI = vfs_config.JA2113.ini
 ; JA2 Vanilla
 ; VFS_CONFIG_INI = vfs_config.JA2Vanilla.ini
 
-;required to use p4items-p9items
-;for now, set to 0 if playing vanilla
+;******************************************************************************************************************************
+; If set to 1, the externalized ja2set.dat (ja2set.dat.xml) will be used.
+; Required to use p4items-p9items.
+; If you want to play JA2 Vanilla style ("Data"), set the value to 0.
+;******************************************************************************************************************************
+
 USE_XML_TILESETS = 1
 
 ;******************************************************************************************************************************
diff --git a/Ja2_UB.ini b/Ja2_UB.ini
index 511e0e8b3..5fc293b6b 100644
--- a/Ja2_UB.ini
+++ b/Ja2_UB.ini
@@ -27,6 +27,14 @@ VFS_NO_UNICODE = FALSE
 ; 1.13 - Unfinished Business
 VFS_CONFIG_INI=Data-UB\VFS\vfs_config.JA2113_UB.ini, Data-UB\VFS\Temp\vsf_Config.UBTemp.ini, Data-UB\VFS\Temp\vsf_Config.Temp.ini
 
+;******************************************************************************************************************************
+; If set to 1, the externalized ja2set.dat (ja2set.dat.xml) will be used.
+; Required to use p4items-p9items.
+; JA2 1.13 - Unfinished Business currently only works with ja2set.dat
+;******************************************************************************************************************************
+
+USE_XML_TILESETS = 0
+
 ;******************************************************************************************************************************
 ; This only has effect if you use the INI Editor to start Jagged Alliance 2 v1.13.
 ; Otherwise you can ignore that.