diff --git a/docs/reference/cro-http-middleware.md b/docs/reference/cro-http-middleware.md
index 8162800..252c463 100644
--- a/docs/reference/cro-http-middleware.md
+++ b/docs/reference/cro-http-middleware.md
@@ -156,7 +156,7 @@ class HSTS does Cro::HTTP::Middleware::Response {
     method process(Supply $responses) {
         supply whenever $responses -> $rep {
             $rep.append-header: 'Strict-transport-security',
-                "max-age=$!max-age"
+                "max-age=$!max-age";
             emit $rep;
         }
     }