1 files changed, 1 insertions, 1 deletions
diff --git a/src/rest.cpp b/src/rest.cpp
index aaaaba4cd0..5f99e26bad 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -206,7 +206,7 @@ static bool rest_headers(HTTPRequest* req,
         return true;
     }
     default: {
-        return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: .bin, .hex)");
+        return RESTERR(req, HTTP_NOT_FOUND, "output format not found (available: .bin, .hex, .json)");
     }
     }
 }