link to pysketcher

README.md

@@ -1,6 +1,6 @@
 ## jupytersketcher
 
-Tool for creating sketches of physics problems in terms of Python code. This work is based upon pysketcher originally developped by HPL [see Wikipedia](https://en.wikipedia.org/wiki/Hans_Petter_Langtangen).
+Tool for creating sketches of physics problems in terms of Python code. This work is based upon [pysketcher](https://github.com/hplgit/pysketcher) originally developped by HPL [see Wikipedia](https://en.wikipedia.org/wiki/Hans_Petter_Langtangen).
 
 Note: Use the term Pysketcher as jupytersketcher in this documentation
 

jupysketch-doc/docs/sketcher.md

@@ -1,5 +1,7 @@
 ## A language to describe a sketch
 
+Pysketcher initial version [HPL Pysketcher]() defines sketch in python.
+
 ## Example
 ```yaml
 libraries: ["from math import tan, radians, sin, cos",