diff --git a/api.md b/api.md
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+# Techage API Functions
+
+Techage API function to adapt/prepare techage for other mods/games.
+
+
+
+## Move/Fly Controller
+
+Register node names for nodes allowed to be moved by fly/move controllers.
+
+This is only necessary for undiggable/intelligent nodes with one of the following attributes:
+
+- ```drop = ""```
+- ```diggable = false```
+- ```after_dig_node ~= nil```
+
+```lua
+techage.register_simple_nodes(node_names, is_valid)
+```
+
+- `is_valid = true`  - Add node to the list of simple nodes
+- `is_valid = false`  - Remove node from the list of simple nodes
+
+Example:
+
+```lua
+techage.register_simple_nodes({"techage:power_lineS"}, true)
+```
+
+For door nodes used as sliding doors by means of the move controller, call in addition:
+
+```lua
+techage.flylib.protect_door_from_being_opened(node_name)
+```
+
+
+
+## TA1 Hammer
+
+Register stone/gravel name pair for the hammer blow:
+
+```lua
+techage.register_stone_gravel_pair(stone_name, gravel_name)
+```
+
+Example:
+
+```lua
+techage.register_stone_gravel_pair("default:stone", "default:gravel")
+```
+
+
+
+## TA1 Melting Pot
+
+Register a pot recipe:
+
+```lua
+techage.ironage_register_recipe(recipe)
+```
+
+Examples:
+
+```lua
+techage.ironage_register_recipe({
+	output = "default:obsidian",
+	recipe = {"default:cobble"},
+	heat = 10,	-- Corresponds to the tower height
+	time = 8,	-- Cooking time in seconds
+})
+techage.ironage_register_recipe({
+	output = "default:bronze_ingot 4",
+	recipe = {"default:copper_ingot", "default:copper_ingot", "default:copper_ingot", "default:tin_ingot"},
+	heat = 4,	-- Corresponds to the tower height
+	time = 8,	-- Cooking time in seconds
+})
+```
+
+
+
+## TA2/TA3/TA4 Autocrafter
+
+Register any nodes/items that should not be crafted via the autocrafter.
+
+```lua
+techage.register_uncraftable_items(item_name)
+```
+
+
+
+## TA2/TA3/TA4 Gravel Sieve
+
+Change the probability of ores or register new ores for sieving. 
+
+```lua
+techage.register_ore_for_gravelsieve(ore_name, probability)
+```
+
+Example:
+
+```lua
+techage.register_ore_for_gravelsieve("default:iron_lump", 30)
+```
+
+Default values for MTG are:
+
+```lua
+-- higher value means less frequent occurrence
+techage:baborium_lump    100000  -- hardly ever
+default:mese_crystal     548     -- every 548th time
+default:gold_lump        439
+default:tin_lump         60
+default:diamond          843
+default:copper_lump      145
+default:coal_lump        11
+default:iron_lump        15
+```
+
+
+
+## TA2/TA3/TA4 Gravel Rinser
+
+Add a rinser recipe.
+
+```lua
+techage.add_rinser_recipe(recipe)
+```
+
+Example:
+
+```lua
+techage.add_rinser_recipe({input = "techage:sieved_gravel", output = "techage:usmium_nuggets", probability = 30})
+```
+
+
+
+## TA2/TA3/TA4 Grinder
+
+Add a grinder recipe.
+
+```lua
+techage.add_grinder_recipe(recipe, ta1_permitted)
+```
+
+Examples:
+
+```lua
+echage.add_grinder_recipe({input = "default:cobble", output = "default:gravel"})
+techage.add_grinder_recipe({input = "default:sandstone", output = "default:sand 4"})
+```
+
+
+
+## TA3/TA4 Electronic Fab, TA4 Doser
+
+Add recipes to an electronic fab or doser (chemical reactor):
+
+
+```lua
+techage.recipes.add(rtype, recipe)
+```
+
+`rtype` is one of: `ta2_electronic_fab` , `ta4_doser`
+
+A recipe look like:
+
+```
+{
+    output = "<item-name> <units>",  -- units = 1..n
+    waste = "<item-name> <units>",   -- units = 1..n
+    input = {                        -- up to 4 items
+        "<item-name> <units>",
+        "<item-name> <units>",
+    },
+}
+```
+
+Examples:
+
+```lua
+techage.recipes.add("ta2_electronic_fab", {
+	output = "techage:vacuum_tube 2",
+	waste = "basic_materials:empty_spool 1",
+	input = {"default:glass 1", "basic_materials:copper_wire 1", "basic_materials:plastic_sheet 1", "techage:usmium_nuggets 1"}
+})
+
+techage.recipes.add("ta4_doser", {
+	output = "techage:naphtha 1",
+	input = {
+		"techage:fueloil 1",
+	},
+	catalyst = "techage:gibbsite_powder",
+})
+```
+
+
+
+## TA3 Furnace
+
+Register recipe:
+
+```lua
+techage.furnace.register_recipe(recipe)
+```
+
+Example:
+
+```lua
+techage.furnace.register_recipe({
+	output = "default:bronze_ingot 4",
+	recipe = {"default:copper_ingot", "default:copper_ingot", "default:copper_ingot", "default:tin_ingot"},
+	time = 2,  -- in seconds
+}) 
+```
+
+
diff --git a/manuals/manual_ta1_DE.md b/manuals/manual_ta1_DE.md
index b0de021..53de1bf 100644
--- a/manuals/manual_ta1_DE.md
+++ b/manuals/manual_ta1_DE.md
@@ -51,7 +51,7 @@ Bauanleitung (siehe auch Plan):
 * Baue einen Turm aus Stein (cobble) mit einer 3x3 Grundfläche (7-11 Blöcke hoch)
 * Lasse unten ein Loch an einer Seite offen
 * Lege einen Anzünder (lighter) hinein
-* Fülle den Turm von oben bis zum Rand mit Holzkohle
+* Fülle den Turm bis zum Rand mit Holzkohle, in dem du die Holzkohle von oben in das Loch fallen lässt
 * Zünde den Anzünder durch das Loch an
 * Platziere den Schmelztiegel in die Flamme über dem Turm
   einen Block über der Flamme)
diff --git a/manuals/manual_ta1_EN.md b/manuals/manual_ta1_EN.md
index 41dada3..4b356eb 100644
--- a/manuals/manual_ta1_EN.md
+++ b/manuals/manual_ta1_EN.md
@@ -50,7 +50,7 @@ Building instructions (see also plan):
 * Build a stone tower (cobble) with a 3x3 base (7-11 blocks high)
 * Leave a hole open on one side at the bottom
 * Put a lighter in it
-* Fill the tower with charcoal from the top to the top
+* Fill the tower to the brim with charcoal by dropping the charcoal into the hole from above
 * Light the lighter through the hole
 * Place the melting pot in the flame over the tower
   (one block above the flame)