Add a comment or two. Maybe even three.

diff --git a/ARLFrame.lua b/ARLFrame.lua
index 8862757..7b7a44b 100644
--- a/ARLFrame.lua
+++ b/ARLFrame.lua
@@ -2288,6 +2288,7 @@ local function expandEntry(dsIndex)
 				tinsert(DisplayStrings, dsIndex, t)
 				dsIndex = dsIndex + 1
 			end
+		-- Mobs can be in instances, raids, or specific mob related drops.
 		elseif (v["Type"] == ACQUIRE_MOB) and (obtainDB.mobdrop or obtainDB.instance or obtainDB.raid) then
 			local mob = mobDB[v["ID"]]
 			t.String = pad .. addon:MobDrop(L["Mob Drop"] .. " : ") .. addon:Red(mob["Name"])