diff --git a/src/zap.c b/src/zap.c
index ae4a16889..3faf11645 100644
--- a/src/zap.c
+++ b/src/zap.c
@@ -5614,12 +5614,16 @@ u_adtyp_resistance_obj(int dmgtyp)
     if (!prop)
         return 0;
 
-    /* Items that give an extrinsic resistance give 99% protection to
-       your items */
-    if ((u.uprops[prop].extrinsic & (W_ARMOR | W_ACCESSORY | W_WEP)) != 0)
+    /* FIXME? these percentages (99 and 90) seem too high... */
+
+    /* items that give an extrinsic resistance when worn or wielded or
+       carried give 99% protection to your items */
+    if ((u.uprops[prop].extrinsic & (W_ARMOR | W_ACCESSORY | W_WEP | W_ART))
+        != 0L)
         return 99;
 
-    /* Dwarvish cloaks give a 90% protection to items against heat and cold */
+    /* worn dwarvish cloaks give 90% protection against heat and cold to
+       carried items */
     if (uarmc && uarmc->otyp == DWARVISH_CLOAK
         && (dmgtyp == AD_COLD || dmgtyp == AD_FIRE))
         return 90;