diff --git a/mods/tools/init.lua b/mods/tools/init.lua
index 1707112..4c00b2a 100644
--- a/mods/tools/init.lua
+++ b/mods/tools/init.lua
@@ -733,8 +733,8 @@ minetest.register_tool("tools:reveal", {
 
 		local limit = 32
 		local ppos = vector.floor(digger:get_pos())
-		local nodes = {}
-		local needle = {"group:axe", "group:shovel", "group:pickaxe", "group:hand"}
+		local nodeslist = {}
+		local needle = {"group:axe", "group:shovel", "group:pickaxe", "group:hand", "nodes:placeholder"}
 		for d = 3, 6 do
 			if limit > 0 then
 				local poslist, _ = minetest.find_nodes_in_area(vector.subtract(ppos, d),
@@ -745,7 +745,7 @@ minetest.register_tool("tools:reveal", {
 					if limit > 0 then
 						if v.x < box.maxp.x and v.y < box.maxp.y and v.z < box.maxp.z and
 								v.x > box.minp.x and v.y > box.minp.y and v.z > box.minp.z then
-							nodes[minetest.pos_to_string(v)] = 1
+							nodeslist[minetest.pos_to_string(v)] = 1
 							limit = limit - 1
 						end
 					end
@@ -753,7 +753,7 @@ minetest.register_tool("tools:reveal", {
 			end
 		end
 
-		for k, _ in pairs(nodes) do
+		for k, _ in pairs(nodeslist) do
 			local pos = minetest.string_to_pos(k)
 			local node = minetest.get_node(pos)
 			local groups = minetest.registered_nodes[node.name] and