diff --git a/api.lua b/api.lua
index 61de155..0bb21f1 100644
--- a/api.lua
+++ b/api.lua
@@ -36,6 +36,9 @@ industrialtest.api.addPowerStorage=function(meta,capacity,flow,ioConfig)
 	meta:set_int("industrialtest.powerAmount",0)
 	meta:set_string("industrialtest.ioConfig",ioConfig)
 end
+-- \brief Checks if metadata contains power storage
+-- \param meta MetaDataRef which should be checked
+-- \returns true if metadata contains power storage, false otherwise
 industrialtest.api.hasPowerStorage=function(meta)
 	local values={"industrialtest.powerCapacity","industrialtest.powerFlow","industrialtest.powerAmount","industrialtest.ioConfig"}
 	for _,value in ipairs(values) do
@@ -45,12 +48,19 @@ industrialtest.api.hasPowerStorage=function(meta)
 	end
 	return true
 end
+-- \brief Updates itemstack description to show current power storage information, additionally updates item wear bar.
+--        Function doesn't check if itemstack contains power storage so you should be sure that it does before calling this function
+-- \param itemstack ItemStack which should be updated
+-- \returns nil
 industrialtest.api.updateItemPowerText=function(itemstack)
 	local meta=itemstack:get_meta()
 	local def=minetest.registered_tools[itemstack:get_name()]
 	meta:set_string("description",S("@1\n@2 / @3 EU",def.description,meta:get_int("industrialtest.powerAmount"),meta:get_int("industrialtest.powerCapacity")))
 	itemstack:set_wear(65535-meta:get_int("industrialtest.powerAmount")/meta:get_int("industrialtest.powerCapacity")*65534)
 end
+-- \brief Adds power storage to item depending on it's definition
+-- \param itemstack ItemStack to which item storage should be added
+-- \returns true if power storage was successfully added, false otherwise
 industrialtest.api.preparePowerStorageItem=function(itemstack)
 	local meta=itemstack:get_meta()
 	local def=minetest.registered_tools[itemstack:get_name()]
@@ -61,6 +71,9 @@ industrialtest.api.preparePowerStorageItem=function(itemstack)
 	industrialtest.api.updateItemPowerText(itemstack)
 	return true
 end
+-- \brief Sets uses metadata value depending on item's definition
+-- \param itemstack ItemStack which should be altered
+-- \returns true if value was successfully added, false otherwise
 industrialtest.api.prepareToolItem=function(itemstack)
 	local def=minetest.registered_tools[itemstack:get_name()]
 	if not def or not def._industrialtest_tool or not def.tool_capabilities or not def.tool_capabilities.uses then
@@ -70,6 +83,9 @@ industrialtest.api.prepareToolItem=function(itemstack)
 	meta:set_int("industrialtest.uses",def.tool_capabilities.uses)
 	return true
 end
+-- \brief Adds wear to item after it's use
+-- \param itemstack ItemStack to which wear should be added
+-- \returns nil
 industrialtest.api.afterToolUse=function(itemstack)
 	local meta=itemstack:get_meta()
 	local def=minetest.registered_tools[itemstack:get_name()]
@@ -92,9 +108,16 @@ industrialtest.api.afterToolUse=function(itemstack)
 	meta:set_int("industrialtest.uses",uses)
 	itemstack:set_wear(65535-uses/def.tool_capabilities.uses*65535)
 end
+-- \brief Checks if power storage is fully charged
+-- \param meta MetaDataRef which should be checked
+-- \returns true if power storage is fully charged, false otherwise
 industrialtest.api.isFullyCharged=function(meta)
 	return meta:get_int("industrialtest.powerAmount")>=meta:get_int("industrialtest.powerCapacity")
 end
+-- \brief Adds power to power storage. Function doesn't check if meta contains power storage so you must be sure that it does.
+-- \param meta MetaDataRef to which power should be added
+-- \param amount Amount of power to add
+-- \returns How much of power was actually added
 industrialtest.api.addPower=function(meta,amount)
 	local powerAmount=meta:get_int("industrialtest.powerAmount")
 	local powerCapacity=meta:get_int("industrialtest.powerCapacity")
@@ -103,6 +126,10 @@ industrialtest.api.addPower=function(meta,amount)
 	meta:set_int("industrialtest.powerAmount",powerAmount)
 	return powerAmount-prevPowerAmount
 end
+-- \brief Adds power to itemstack. Function checks if itemstack has power storage.
+-- \param itemstack ItemStack to which add power
+-- \param amount How much power to add
+-- \returns Amount of power added
 industrialtest.api.addPowerToItem=function(itemstack,amount)
 	local meta=itemstack:get_meta()
 	if not industrialtest.api.hasPowerStorage(meta) then
@@ -112,6 +139,10 @@ industrialtest.api.addPowerToItem=function(itemstack,amount)
 	industrialtest.api.updateItemPowerText(itemstack)
 	return added
 end
+-- \brief Adds power to destination metadata while subtracting it from source metadata
+-- \Param srcMeta MetaDataRef from which take power
+-- \param destMeta MetaDataRef to which add power
+-- \returns How much of power was actually transferred
 industrialtest.api.transferPower=function(srcMeta,destMeta,amount)
 	local currentFlow=math.min(srcMeta:get_int("industrialtest.powerAmount"),amount)
 	if currentFlow==0 then
@@ -121,6 +152,10 @@ industrialtest.api.transferPower=function(srcMeta,destMeta,amount)
 	srcMeta:set_int("industrialtest.powerAmount",srcMeta:get_int("industrialtest.powerAmount")-actualFlow)
 	return actualFlow
 end
+-- \brief Adds power to destination itemstack while subtracting it from source metadata
+-- \param srcMeta MetaDataRef from which take power
+-- \param itemstack ItemStack to which add power
+-- \returns How much of power was actually transferred
 industrialtest.api.transferPowerToItem=function(srcMeta,itemstack,amount)
 	local currentFlow=math.min(srcMeta:get_int("industrialtest.powerAmount"),amount)
 	if currentFlow==0 then
@@ -130,6 +165,10 @@ industrialtest.api.transferPowerToItem=function(srcMeta,itemstack,amount)
 	srcMeta:set_int("industrialtest.powerAmount",srcMeta:get_int("industrialtest.powerAmount")-actualFlow)
 	return actualFlow
 end
+-- \brief Transfers power from source node to all neighbouring nodes
+-- \param pos Vector with position of source node
+-- \returns two values: true if any neighbouring node has room for more power, false otherwise
+--                      true if any power was transferred, false otherwise
 industrialtest.api.powerFlow=function(pos)
 	local meta=minetest.get_meta(pos)
 	if not industrialtest.api.hasPowerStorage(meta) then
@@ -189,6 +228,9 @@ industrialtest.api.powerFlow=function(pos)
 	end
 	return roomAvailable,transferred
 end
+-- \brief Starts node timer of neighbouring nodes with center node
+-- \param pos Vector with position of center node
+-- \returns nil
 industrialtest.api.triggerNeighbours=function(pos)
 	local neighbourPositions={
 		vector.offset(pos,-1,0,0),
@@ -206,9 +248,15 @@ industrialtest.api.triggerNeighbours=function(pos)
 		end
 	end
 end
+-- \brief Returns opposite side of provided one
+-- \param side Side number. See industrialtest.api.addPowerStorage for order
+-- \returns Opposite side
 industrialtest.api.getOppositeSide=function(side)
 	return (side%2==0 and side-1 or side+1)
 end
+-- \brief Returns connections of node with power storage
+-- \param pos Vector with position of node with power storage
+-- \returns Table with side numbers
 industrialtest.api.getConnections=function(pos)
 	local result={}
 	local neighbourPositions={
@@ -229,21 +277,42 @@ industrialtest.api.getConnections=function(pos)
 	end
 	return result
 end
+-- \brief Changes node's power IO config. Function doesn't check if meta actually contains power storage.
+-- \param meta MetaDataRef of node which power IO config should be changed
+-- \param side Side number. See industrialtest.api.addPowerStorage to check order.
+-- \param mode Side mode. See industrialtest.api.addPowerStorage for possible values.
+-- \returns nil
 industrialtest.api.changeIoConfig=function(meta,side,mode)
 	local ioConfig=meta:get_string("industrialtest.ioConfig")
 	ioConfig=string.sub(ioConfig,1,side-1)..mode..string.sub(ioConfig,side+1)
 	meta:set_string("industrialtest.ioConfig",ioConfig)
 end
+-- \brief Checks if provided side is power input
+-- \param meta MetaDataRef of node
+-- \param side Side number. See industrialtest.api.addPowerStorage to check order.
+-- \returns true if provided side is power input, false otherwise
 industrialtest.api.isPowerInput=function(meta,side)
 	local ioConfig=meta:get_string("industrialtest.ioConfig")
 	local mode=string.sub(ioConfig,side,side)
 	return (mode=="i" or mode=="a")
 end
+-- \brief Checks if provided side is power output
+-- \param meta MetaDataRef of node
+-- \param side Side number. See industrialtest.api.addPowerStorage to check order.
+-- \returns true if provided side is power output, false otherwise
 industrialtest.api.isPowerOutput=function(meta,side)
 	local ioConfig=meta:get_string("industrialtest.ioConfig")
 	local mode=string.sub(ioConfig,side,side)
 	return (mode=="o" or mode=="a")
 end
+-- \brief Registers dust of certain resource
+-- \param name Technical name of resource
+-- \param displayName Display name of resource
+-- \param resources List of tables with following keys: <output>, <recipe>, [count(1)]
+--                                                      <> - required, [] - optional, () - default value
+-- \param color HTML color of dust
+-- \param registerMaceratorRecipe If true macerator recipe for dust will be registered
+-- \returns nil
 industrialtest.api.registerResourceDust=function(name,displayName,resources,color,registerMaceratorRecipe)
 	minetest.register_craftitem("industrialtest:"..name.."_dust",{
 		description=S(displayName.." Dust"),
@@ -259,6 +328,9 @@ industrialtest.api.registerResourceDust=function(name,displayName,resources,colo
 		end
 	end
 end
+-- \brief Registers macerator recipe
+-- \param config Table with keys: <output>, <recipe>, [time(2)]
+-- \returns nil
 industrialtest.api.registerMaceratorRecipe=function(config)
 	local definition={
 		output=config.output or "",
@@ -267,9 +339,15 @@ industrialtest.api.registerMaceratorRecipe=function(config)
 	}
 	industrialtest.api.maceratorRecipes[definition.recipe]=definition
 end
+-- \brief Returns macerator recipe result
+-- \param recipe String ID of resulting conten
+-- \returns Table with following keys: output, recipe, time
 industrialtest.api.getMaceratorRecipeResult=function(recipe)
 	return industrialtest.api.maceratorRecipes[recipe]
 end
+-- \brief Registers compressor recipe
+-- \param config Table with following keys: <output>, <recipe>, [time(2)], [count(1)]
+-- \returns nil
 industrialtest.api.registerCompressorRecipe=function(config)
 	local definition={
 		output=config.output or "",
@@ -279,6 +357,9 @@ industrialtest.api.registerCompressorRecipe=function(config)
 	}
 	industrialtest.api.compressorRecipes[definition.recipe]=definition
 end
+-- \brief Returns macerator recipe result
+-- \param recipe String ID of resulting conten
+-- \returns Table with following keys: output, recipe, time
 industrialtest.api.getCompressorRecipeResult=function(recipe)
 	return industrialtest.api.compressorRecipes[recipe]
 end