diff --git a/README.md b/README.md
index b50d678..e692a76 100644
--- a/README.md
+++ b/README.md
@@ -231,8 +231,8 @@ _Will fill later_
 
 ## License
 
-- Original created by [AGulev](https://github.com/AGulev)
 - Developed and supporting by [Insality](https://github.com/Insality)
+- Original idea by [AGulev](https://github.com/AGulev)
 - Assets from [Kenney](http://www.kenney.nl/)
 
 **MIT** License
diff --git a/druid/base/static_grid.lua b/druid/base/static_grid.lua
index ffdd11c..2dd9a42 100644
--- a/druid/base/static_grid.lua
+++ b/druid/base/static_grid.lua
@@ -226,6 +226,11 @@ function StaticGrid:clear()
 end
 
 
+--- Return elements offset for correct posing nodes. Correct posing at
+-- parent pivot node (0:0) with adjusting of node sizes and anchoring
+-- @function static_grid:_get_zero_offset
+-- @treturn vector3 The offset vector
+-- @local
 function StaticGrid:_get_zero_offset()
 	-- zero offset: center pos - border size * anchor
 	return vmath.vector3(
diff --git a/druid/extended/dynamic_grid.lua b/druid/extended/dynamic_grid.lua
index 212afcc..ff96d4f 100644
--- a/druid/extended/dynamic_grid.lua
+++ b/druid/extended/dynamic_grid.lua
@@ -357,6 +357,11 @@ function DynamicGrid:_get_node_size(node)
 end
 
 
+--- Return elements offset for correct posing nodes. Correct posing at
+-- parent pivot node (0:0) with adjusting of node sizes and anchoring
+-- @function dynamic_grid:_get_zero_offset
+-- @treturn vector3 The offset vector
+-- @local
 function DynamicGrid:_get_zero_offset()
 	-- zero offset: center pos - border size * anchor
 	return vmath.vector3(
@@ -366,6 +371,7 @@ function DynamicGrid:_get_zero_offset()
 end
 
 
+--- Return side vector to correct node shifting
 function DynamicGrid:_get_side_vector(side, is_forward)
 	if side == const.SIDE.X then
 		return is_forward and SIDE_VECTORS.RIGHT or SIDE_VECTORS.LEFT