diff --git a/html/changelogs/AutoChangeLog-pr-13517.yml b/html/changelogs/AutoChangeLog-pr-13517.yml
new file mode 100644
index 0000000000..8f29517058
--- /dev/null
+++ b/html/changelogs/AutoChangeLog-pr-13517.yml
@@ -0,0 +1,4 @@
+author: "silicons"
+delete-after: True
+changes: 
+  - bugfix: "simple mobs are now immune to radioactive contamination"