diff --git a/src/Framework/Framework/ResourceManagement/ResourceRepositoryExtensions.cs b/src/Framework/Framework/ResourceManagement/ResourceRepositoryExtensions.cs
index 0abb6a4ff9..5026850c01 100644
--- a/src/Framework/Framework/ResourceManagement/ResourceRepositoryExtensions.cs
+++ b/src/Framework/Framework/ResourceManagement/ResourceRepositoryExtensions.cs
@@ -77,7 +77,6 @@ public static LinkResourceBase RegisterScriptFile(
         /// <summary> Registers a <see cref="ScriptModuleResource" /> from the specified file.
         /// The file can be anywhere in the filesystem, it does not have to be in the wwwroot folder.
         /// DotVVM will handle its serving, caching, ... automatically </summary>
-        [Obsolete("<script type='module'> is always deferred, the attribute does nothing")]
         public static LinkResourceBase RegisterScriptModuleFile(
             this DotvvmResourceRepository repo,
             string name,
@@ -88,7 +87,7 @@ public static LinkResourceBase RegisterScriptModuleFile(
         /// <summary> Registers a <see cref="ScriptModuleResource" /> from the specified file.
         /// The file can be anywhere in the filesystem, it does not have to be in the wwwroot folder.
         /// DotVVM will handle its serving, caching, ... automatically </summary>
-        [Obsolete("<script type='module'> is always deferred, the attribute does nothing")]
+        [Obsolete("<script type='module'> is always deferred, the attribute does nothing. Please remove the defer parameter.")]
         public static LinkResourceBase RegisterScriptModuleFile(
             this DotvvmResourceRepository repo,
             string name,