diff --git a/reader/sanitizer/sanitizer.go b/reader/sanitizer/sanitizer.go
index b9b4510c..29b5d3fa 100644
--- a/reader/sanitizer/sanitizer.go
+++ b/reader/sanitizer/sanitizer.go
@@ -414,7 +414,7 @@ func getTagAllowList() map[string][]string {
 	whitelist["wbr"] = []string{}
 	whitelist["dfn"] = []string{}
 	whitelist["sub"] = []string{}
-	whitelist["sup"] = []string{}
+	whitelist["sup"] = []string{"id"}
 	whitelist["var"] = []string{}
 	whitelist["samp"] = []string{}
 	whitelist["s"] = []string{}