diff --git a/.gitignore b/.gitignore
index ebdda7ed5cb0ca821b845769630e81d438ba9731..130c46a0ade1ee45ff68440f391d5c8b6791137a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ build
 
 demos/*
 !demos/__init__.py
+!demos/demos_core.py
 !demos/demo_faraday.py
 !demos/demo_faraday_map.npy
 !demos/demo_excaliwir.py