diff --git a/Schemas/rsi.json b/Schemas/rsi.json
index 56d52c7be1d..45067ba635f 100644
--- a/Schemas/rsi.json
+++ b/Schemas/rsi.json
@@ -83,7 +83,8 @@
                 "CC-BY-NC-4.0",
                 "CC-BY-NC-SA-3.0",
                 "CC-BY-NC-SA-4.0",
-                "CC0-1.0"
+                "CC0-1.0",
+                "Custom"
             ],
             "examples": [
                 "CC-BY-SA-3.0"