diff --git a/schemas/metadata.json b/schemas/metadata.json
index 875bff1be3..ee65f5e9f4 100644
--- a/schemas/metadata.json
+++ b/schemas/metadata.json
@@ -644,6 +644,7 @@
           "NonFreeDep",
           "UpstreamNonFree",
           "NonFreeAssets",
+          "NSFW",
           "KnownVuln",
           "ApplicationDebuggable",
           "NoSourceSince"