diff --git a/mods/CORE/mcl_commands/PROOF_OF_CONCEPT.md b/mods/CORE/mcl_commands/PROOF_OF_CONCEPT.md
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+### `mcl_commands.register_command(name, def)`
+
+#### Complex commands (WIP):
+
+```
+mcl_commands.register_command("test", {
+	type = "complex",
+	priv_level = 4,
+	func = function(context)
+		if self.match_type("int", {min=1, max=255} then
+			print(self.last_type)
+		end
+	end,
+})
+```
+
+#### Basic commands:
+
+* `context.type` is the context of execution: `player` or `commandblock`
+* `context.commander` is the executor/commander of the command
+* `context.pos` is the position where the command is executed
+
+This param allow the use of position target selectors
+
+```
+mcl_commands.register_command("test", {
+	type = "basic",
+	priv_level = 4,
+	func = function(context)
+		if context.commander then
+			print(context.pos)
+			print("--------")		 --this "concept" param allow to run command correctly
+									 --(with target selector and logging) from mods or command blocks
+			return true, S("Succesfull")
+		end
+	end,
+})
+```
+
+### `mcl_commands.execute_command(name, params, context)`
+
+#### As a player:
+```
+mcl_commands.execute_command("test", "foo bar true 1", {commander=player, pos=player:get_pos()})
+```
+#### As a command block:
+```
+mcl_commands.execute_command("test", "foo bar true 1", {commander=commander, pos=node_pos})
+```
+
+### `mcl_commands.get_target_selector(target_selector)`
+
+This function allow mods and commands to get the result of a given target selector in that form: `@e[gamemode=creative,limit=5]`
+
+This function returns a code indicating the success and a table of ObjectRefs (can be empty)
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