diff --git a/lib/app-integrator.js b/lib/app-integrator.js
index f8acb5b..94db6cf 100644
--- a/lib/app-integrator.js
+++ b/lib/app-integrator.js
@@ -1,7 +1,7 @@
 
 'use strict';
 
-const EXTENSION_NAMESPACE = 'textmarker';
+const Const = require('./const');
 
 class AppIntegrator {
 
@@ -26,14 +26,14 @@ class AppIntegrator {
     _registerCommands(context) {
         const app = this._app;
         const disposable = this._vscode.commands.registerCommand(
-                `${EXTENSION_NAMESPACE}.clearAllHighlight`, app.clearAllHighlight.bind(app));
+                `${Const.EXTENSION_NAME}.clearAllHighlight`, app.clearAllHighlight.bind(app));
         context.subscriptions.push(disposable);
     }
 
     _registerTextEditorCommands(context) {
         const app = this._app;
         const disposable = this._vscode.commands.registerTextEditorCommand(
-                `${EXTENSION_NAMESPACE}.markText`, app.markText.bind(app));
+                `${Const.EXTENSION_NAME}.markText`, app.markText.bind(app));
         context.subscriptions.push(disposable);
     }
 
diff --git a/lib/config-store.js b/lib/config-store.js
index 2f82560..5252db6 100644
--- a/lib/config-store.js
+++ b/lib/config-store.js
@@ -1,13 +1,15 @@
 
 'use strict';
 
+const Const = require('./const');
+
 class ConfigStore {
     constructor(params) {
         this._workspace = params.workspace;
     }
 
     get(configName) {
-        const extensionConfig = this._workspace.getConfiguration('textmarker');
+        const extensionConfig = this._workspace.getConfiguration(Const.EXTENSION_NAME);
         return extensionConfig.get(configName);
     }
 }
diff --git a/lib/const.js b/lib/const.js
new file mode 100644
index 0000000..9d09bf2
--- /dev/null
+++ b/lib/const.js
@@ -0,0 +1,6 @@
+
+module.exports = {
+
+    EXTENSION_NAME: 'textmarker'
+
+};