diff --git a/aider/watch.py b/aider/watch.py
index c346b13417e..29b34759335 100644
--- a/aider/watch.py
+++ b/aider/watch.py
@@ -37,6 +37,8 @@ def is_source_file(path: Path) -> bool:
         ".profile",
         ".yaml",
         ".yml",
+        ".ex",  #Elixir
+        ".exs", #Elixir
         # // style comments
         ".js",
         ".ts",