diff --git a/Wox.Core/Plugin/PluginManager.cs b/Wox.Core/Plugin/PluginManager.cs
index 7d99c2ec34..d6b36bbb26 100644
--- a/Wox.Core/Plugin/PluginManager.cs
+++ b/Wox.Core/Plugin/PluginManager.cs
@@ -141,14 +141,10 @@ namespace Wox.Core.Plugin
             {
                 var customizedPluginConfig = UserSettingStorage.Instance.
                     CustomizedPluginConfigs.FirstOrDefault(o => o.ID == plugin.Metadata.ID);
-                if (customizedPluginConfig != null && customizedPluginConfig.Disabled)
-                {
-                    return;
-                }
+                if (customizedPluginConfig != null && customizedPluginConfig.Disabled) return;
                 if (query.IsIntantQuery && IsInstantSearchPlugin(plugin.Metadata))
                 {
-                    Debug.WriteLine(string.Format("Plugin {0} is executing instant search.", plugin.Metadata.Name));
-                    using (new Timeit("  => instant search took: "))
+                    using (new Timeit($"Plugin {plugin.Metadata.Name} is executing instant search"))
                     {
                         QueryForPlugin(plugin, query);
                     }
@@ -190,16 +186,17 @@ namespace Wox.Core.Plugin
         /// <returns></returns>
         private static bool IsVailldActionKeyword(string actionKeyword)
         {
-            if (string.IsNullOrEmpty(actionKeyword) || actionKeyword == Query.ActionKeywordWildcardSign) return false;
+            if (string.IsNullOrEmpty(actionKeyword) || actionKeyword == Query.WildcardSign) return false;
             PluginPair pair = AllPlugins.FirstOrDefault(o => o.Metadata.ActionKeyword == actionKeyword);
             if (pair == null) return false;
-            var customizedPluginConfig = UserSettingStorage.Instance.CustomizedPluginConfigs.FirstOrDefault(o => o.ID == pair.Metadata.ID);
+            var customizedPluginConfig = UserSettingStorage.Instance.
+                CustomizedPluginConfigs.FirstOrDefault(o => o.ID == pair.Metadata.ID);
             return customizedPluginConfig == null || !customizedPluginConfig.Disabled;
         }
 
         public static bool IsSystemPlugin(PluginMetadata metadata)
         {
-            return metadata.ActionKeyword == Query.ActionKeywordWildcardSign;
+            return metadata.ActionKeyword == Query.WildcardSign;
         }
 
         public static bool IsInstantQuery(string query)
diff --git a/Wox.Infrastructure/Timeit.cs b/Wox.Infrastructure/Timeit.cs
index 1e92cd8deb..6b6e0d704d 100644
--- a/Wox.Infrastructure/Timeit.cs
+++ b/Wox.Infrastructure/Timeit.cs
@@ -23,7 +23,7 @@ namespace Wox.Infrastructure
                 _stopwatch.Stop();
                 long seconds = _stopwatch.ElapsedMilliseconds;
                 _stopwatch.Start();
-                Debug.WriteLine(_name + ":" + _stopwatch.ElapsedMilliseconds + "ms");
+                Debug.WriteLine(_name + " : " + _stopwatch.ElapsedMilliseconds + "ms");
                 return seconds;
             }
         }
diff --git a/Wox.Plugin/Query.cs b/Wox.Plugin/Query.cs
index e4c6e0fa3a..538b23f9df 100644
--- a/Wox.Plugin/Query.cs
+++ b/Wox.Plugin/Query.cs
@@ -27,6 +27,11 @@ namespace Wox.Plugin
 
         public const string Seperater = " ";
 
+        /// <summary>
+        /// * is used for System Plugin
+        /// </summary>
+        public const string WildcardSign = "*";
+
         internal string ActionKeyword { get; set; }
 
         internal bool IsIntantQuery { get; set; }
@@ -120,6 +125,6 @@ namespace Wox.Plugin
             return String.Empty;
         }
 
-        public const string ActionKeywordWildcardSign = "*";
+
     }
 }
diff --git a/Wox/ActionKeyword.xaml.cs b/Wox/ActionKeyword.xaml.cs
index 4bfe80e445..0e8b8e1382 100644
--- a/Wox/ActionKeyword.xaml.cs
+++ b/Wox/ActionKeyword.xaml.cs
@@ -45,7 +45,7 @@ namespace Wox
             }
 
             //check new action keyword didn't used by other plugin
-            if (tbAction.Text.Trim() != Query.ActionKeywordWildcardSign && PluginManager.AllPlugins.Exists(o => o.Metadata.ActionKeyword == tbAction.Text.Trim()))
+            if (tbAction.Text.Trim() != Query.WildcardSign && PluginManager.AllPlugins.Exists(o => o.Metadata.ActionKeyword == tbAction.Text.Trim()))
             {
                 MessageBox.Show(InternationalizationManager.Instance.GetTranslation("newActionKeywordHasBeenAssigned"));
                 return;