diff --git a/HISTORY.md b/HISTORY.md
index b3c6797..526e9c6 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -8,9 +8,13 @@ and [LEMS](https://github.com/LEMS/LEMS), but also the Python ([libNeuroML](http
 
 **Only contributors who are not [NeuroML Editors](https://docs.neuroml.org/NeuroMLOrg/Board.html) are specifically pointed out below.**
 
-v2.3.1 / 2023-XX-XX
+v2.3.1 / 2024-08-25
 --------------------
 
+* **Renamed the main Schema from NeuroML_v2.3.xsd to [NeuroML_v2.3.1.xsd](https://github.com/NeuroML/NeuroML2/blob/master/Schemas/NeuroML2/NeuroML_v2.3.1).**
+
+* Adds support for external <morphology>/<biophysicalProperties> in cell element. Also simulator mappings for NEURON/NetPyNE support this. See [here](https://docs.neuroml.org/Userdocs/ImportingMorphologyFiles.html#neuroml2) for more details. Multiple examples of NeuroML2/LEMS files using this feature can be found [here](https://github.com/NeuroML/NeuroML2/tree/development/LEMSexamples/morphologies). 
+
 
 
 v2.3 / 2023-09-20