diff --git a/newsfragments/3921.feature b/newsfragments/3921.feature
new file mode 100644
index 000000000..f2c3a98bd
--- /dev/null
+++ b/newsfragments/3921.feature
@@ -0,0 +1,5 @@
+Automatically exit when stdin is closed
+
+This facilitates subprocess management, specifically cleanup.
+When a parent process is running tahoe and exits without time to do "proper" cleanup at least the stdin descriptor will be closed.
+Subsequently "tahoe run" notices this and exits.
\ No newline at end of file