diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 000000000..45513b46c
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,9 @@
+# Security Policy
+
+## Supported Versions
+
+Only the latest version of GZDoom is ever supported - older versions may have vulnerabilities, including older major versions. Legacy trees are maintained separately and sometimes by a different maintainer.
+
+## Reporting a Vulnerability
+
+https://github.com/ZDoom/gzdoom/security/advisories/new