diff --git a/CHANGELOG.md b/CHANGELOG.md
index 25809b5..25ed8d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,19 +10,20 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Update `FileSystemTasks.CopyDirectoryRecursively` to `AbsolutePathExtensions.CopyToDirectory`.
 - Add `SymbolPackageFormat` and `IncludeSymbols` in the package.
 - Update release `*.nupkg` to `*.*nupkg` to copy symbol package format. (Fix: #75)
+- Add `WarningSignFile` to show warning when sign file is empty. (Fix: #74)
 
-## [1.8.1]  / 2024-05-13
+## [1.8.1] / 2024-05-13
 ### Updated
 - Update `GetFileVersionInfo` to find `exe` file.
 - Update `SignProject` to sign `Name`, `AssemblyName`, or `*`.
 - Update `AssemblyExtension` methods to `Obsolete`.
 
-## [1.8.0]  / 2024-03-11
+## [1.8.0] / 2024-03-11
 ### Updated
 - Update `Nuke.Common` Version = `8.0.0`
 - Force enable `EnableUnsafeBinaryFormatterSerialization` to support `net8.0`.
 
-## [1.7.4]  / 2024-02-08
+## [1.7.4] / 2024-02-08
 ### Features
 - Update `GetInformationalVersion` to find `nupkg` files.
 ### Added
diff --git a/ricaun.Nuke/Components/IHazSign.cs b/ricaun.Nuke/Components/IHazSign.cs
index 7b762cf..bc20d1a 100644
--- a/ricaun.Nuke/Components/IHazSign.cs
+++ b/ricaun.Nuke/Components/IHazSign.cs
@@ -31,6 +31,14 @@ public bool SignProject(Project project)
             return SignFolder(projectFolder, $"*{project.Name}*") || SignFolder(projectFolder, $"*{project.GetAssemblyName()}*") || SignFolder(projectFolder);
         }
 
+        internal static bool _waningSignFile = false;
+        internal void WarningSignFile(string message)
+        {
+            if (_waningSignFile) return;
+            _waningSignFile = true;
+            Serilog.Log.Warning(message);
+        }
+
         /// <summary>
         /// Sign Files on the Folder
         /// </summary>
@@ -42,8 +50,16 @@ public bool SignProject(Project project)
         /// <returns></returns>
         public bool SignFolder(string folder, string namePattern = "*", bool dllSign = true, bool nupkgSign = true, bool exeSign = true)
         {
-            if (!SignFile.SkipEmpty()) return false;
-            if (!SignPassword.SkipEmpty()) return false;
+            if (!SignFile.SkipEmpty())
+            {
+                WarningSignFile("SignFile is empty, SignFolder will be skipped. Configure environment variables 'SIGN_FILE' and 'SIGN_PASSWORD'.");
+                return false;
+            }
+            if (!SignPassword.SkipEmpty())
+            {
+                WarningSignFile("SignPassword is empty, SignFolder will be skipped. Configure environment variables 'SIGN_FILE' and 'SIGN_PASSWORD'.");
+                return false;
+            }
 
             var certPath = SignExtension.VerifySignFile(SignFile, BuildAssemblyDirectory);
             var certPassword = SignPassword;