---
 init.lua | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/init.lua b/init.lua
index a24e8ce..27ac710 100644
--- a/init.lua
+++ b/init.lua
@@ -236,6 +236,15 @@ minetest.register_node("teleport_potion:pad", {
 
 			local meta = minetest.get_meta(pos)
 
+			local old_target_coords = {
+				x = meta:get_int("x"),
+				y = meta:get_int("y"),
+				z = meta:get_int("z")
+			}
+
+			local teleport_to_string = minetest.pos_to_string(coords)
+			local teleport_from_string = minetest.pos_to_string(old_target_coords)
+
 			meta:set_int("x", coords.x)
 			meta:set_int("y", coords.y)
 			meta:set_int("z", coords.z)
@@ -249,6 +258,9 @@ minetest.register_node("teleport_potion:pad", {
 					.. coords.x .. "," .. coords.y .. "," .. coords.z .. ")")
 			end
 
+			-- logging the teleportation
+			minetest.log("action", name .. " changed teleport pad from " .. teleport_from_string .. " to " .. teleport_to_string)
+
 			minetest.sound_play("portal_open", {
 				pos = pos,
 				gain = 1.0,
@@ -288,6 +300,9 @@ minetest.register_abm({
 		end
 
 		-- get coords from pad/portal
+
+		local original_object_pos = minetest.pos_to_string(pos)
+
 		local meta = minetest.get_meta(pos)
 		local target_coords = {
 			x = meta:get_int("x"),
@@ -298,6 +313,8 @@ minetest.register_abm({
 		for k, player in pairs(objs) do
 
 			if player then
+				local player_name = player:get_player_name()
+				local teleport_to_string = minetest.pos_to_string(target_coords)
 
 				-- play sound on portal end
 				minetest.sound_play("portal_close", {
@@ -309,6 +326,9 @@ minetest.register_abm({
 				-- move player/object
 				player:setpos(target_coords)
 
+				-- logging the teleportation
+				minetest.log("action", player_name .. " teleported from " .. original_object_pos .. " to " .. teleport_to_string )
+
 				-- paricle effects on arrival
 				tp_effect(target_coords)
 
@@ -354,12 +374,18 @@ potion_entity.on_step = function(self, dtime)
 		or vel.z == 0 then
 
 			if self.player ~= "" then
+				local player_name = self.player:get_player_name()
+				local teleport_to_string = minetest.pos_to_string(self.lastpos)
+				local teleport_from_string = minetest.pos_to_string(pos)
 
 				-- round up coords to fix glitching through doors
 				self.lastpos = vector.round(self.lastpos)
 
 				self.player:setpos(self.lastpos)
 
+				-- logging the teleportation
+				minetest.log("action", player_name .. " teleported to " .. teleport_to_string .. " from " .. original_object_pos)
+
 				minetest.sound_play("portal_close", {
 					pos = self.lastpos,
 					gain = 1.0,
-- 
2.17.1

Could we take this opportunity to submit the patch upstream instead and 
update our teleport potion mod? Last I checked it was quite out of date.