Dependencies.md

@@ -236,6 +236,20 @@ Follow the [recipe at FreeCAD Web][20]
 
 While it is ```activated``` type ```which freecad``` and use this path for the sverchok FreeCad lib path in Preferences. Don't forget to press 'Set Path' before closing the dialog. Restart Blender to take effect.
 
+## Side extending packages
+
+### Install Ladybug 
+[Repository is here][21], but [install addon from here][22]. Ladybug is a Python library to load, analyze and modify EnergyPlus Weather files (epw).
+
+### IFC
+Coming soon and [installation will be here][22]. IFC is schema for architects BIM model to be shared. All significant BIM software supports IFC import/export.
+
+### Sverchok-extra
+You can install [additional extra nodes here][23] with some additional curve/surface/solids/fields nodes.
+
+## Troubles with pip
+If you admit some kind of errors with pip, you can try:
+Wipe all versions of pip from `2.90\python\lib\site-packages` and then run `2.90\python\bin> ./python.exe -m ensurepip -U`
 
 
 
@@ -260,3 +274,6 @@ While it is ```activated``` type ```which freecad``` and use this path for the s
 [18]: https://www.python.org
 [19]: https://www.python.org/downloads/release/python-377/
 [20]: https://forum.freecadweb.org/viewtopic.php?f=42&t=46144&start=10#p397181
+[21]: https://github.com/ladybug-tools/ladybug-blender
+[22]: https://blenderbim.org/download.html
+[23]: https://github.com/portnov/sverchok-extra
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