add release note

PyPSA · Jan 3, 2024 · 2acddb6 · 2acddb6
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diff --git a/doc/release_notes.rst b/doc/release_notes.rst
@@ -81,6 +81,9 @@ Upcoming Release
 
 * Remove HELMETH option.
 
+* Print Irreducible Infeasible Subset (IIS) if model is infeasible. Only for
+  solvers with IIS support.
+
 **Bugs and Compatibility**
 
 * A bug preventing custom powerplants specified in ``data/custom_powerplants.csv`` was fixed. (https://github.com/PyPSA/pypsa-eur/pull/732)