diff --git a/Sources/DiscogsService/Internal/Extensions/String+Constants.swift b/Sources/DiscogsService/Internal/Extensions/String+Constants.swift
index 3d2af2654..852fa6a4c 100644
--- a/Sources/DiscogsService/Internal/Extensions/String+Constants.swift
+++ b/Sources/DiscogsService/Internal/Extensions/String+Constants.swift
@@ -31,6 +31,8 @@ extension String {
         static let authConsumer = "Discogs \(String.Parameter.key)=%@, \(String.Parameter.secret)=%@"
         /// A format for the user authentication header.
         static let authUser = "Discogs \(String.Parameter.token)=%@"
+        /// A format for the user agent header.
+        static let userAgent = "%@/%@ +%@"
     }
 }