diff --git a/README.md b/README.md
index b50e71b..9a253ca 100644
--- a/README.md
+++ b/README.md
@@ -39,9 +39,12 @@ Definition: definition table, containing:
   * texture (essential): texture of the bow, shown in inventory.
   * groups (optional): groups of the item.
   * uses: number of uses of the bow (default is 50).
-  * allow_shot (optional): function(player, itemstack, index):
+  * allow_shot (optional): function(player, itemstack, index, last_run):
     - player: the player using the bow
     - itemstack: the itemstack of the bow
+    - index: index of the arrow in the inventory
+    - last_run: whether this is the last time this function is called before actually calling `spawn_arrow_entity`.
+      Currently, `allow_shot` is actually run twice (once before the delay, and once after).
     - should return true if the shot can be made, and false otherwise
     - the default function checks that the arrow to be thrown is a registered arrow
     - it can return a second return value, which is the new itemstack
diff --git a/init.lua b/init.lua
index 5418edc..2aa271e 100644
--- a/init.lua
+++ b/init.lua
@@ -338,7 +338,7 @@ function throwing.register_bow(name, def)
 
 		local bow_index = user:get_wield_index()
 		local arrow_index = (def.throw_itself and bow_index) or bow_index+1
-		local res, new_stack = def.allow_shot(user, user:get_inventory():get_stack("main", arrow_index), arrow_index)
+		local res, new_stack = def.allow_shot(user, user:get_inventory():get_stack("main", arrow_index), arrow_index, false)
 		if not res then
 			return (def.throw_itself and new_stack) or itemstack
 		end
@@ -352,7 +352,7 @@ function throwing.register_bow(name, def)
 		minetest.after(def.delay or 0, function()
 			-- Re-check that the arrow can be thrown. Overwrite the new_stack
 			local old_new_stack = new_stack
-			res, new_stack = def.allow_shot(user, user:get_inventory():get_stack("main", arrow_index), arrow_index)
+			res, new_stack = def.allow_shot(user, user:get_inventory():get_stack("main", arrow_index), arrow_index, true)
 			if not new_stack then
 				new_stack = old_new_stack
 			end