diff --git a/README.rst b/README.rst
index e553dd5..4e07d20 100644
--- a/README.rst
+++ b/README.rst
@@ -2,12 +2,15 @@
 maxsmooth: Derivative Constrained Function Fitting
 ==================================================
 
+   A jax version of maxsmooth is being developed in a 
+   separate `branch <https://github.com/htjb/maxsmooth/tree/v2-jax>`__.
+
 Introduction
 ------------
 
 :maxsmooth: Derivative Constrained Function Fitting
 :Author: Harry Thomas Jones Bevins
-:Version: 1.2.2
+:Version: 1.2.3
 :Homepage: https://github.com/htjb/maxsmooth
 :Documentation: https://maxsmooth.readthedocs.io/
 
diff --git a/maxsmooth/_version.py b/maxsmooth/_version.py
new file mode 100644
index 0000000..cd7e2da
--- /dev/null
+++ b/maxsmooth/_version.py
@@ -0,0 +1 @@
+__version__ = "1.2.3"
\ No newline at end of file