diff --git a/core/modules/outside_in/css/off-canvas.css b/core/modules/outside_in/css/off-canvas.css
index f9ccda0..8df8ed9 100644
--- a/core/modules/outside_in/css/off-canvas.css
+++ b/core/modules/outside_in/css/off-canvas.css
@@ -1,6 +1,6 @@
 /**
  * @file
- * CSS for OffCanvas tray.
+ * CSS for off-canvas dialog.
  *
  * @todo Move CSS into core dialog library https://www.drupal.org/node/2784443.
  */
diff --git a/core/modules/outside_in/src/Render/MainContent/OffCanvasRender.php b/core/modules/outside_in/src/Render/MainContent/OffCanvasRender.php
index e1f11d6..9119c9b 100644
--- a/core/modules/outside_in/src/Render/MainContent/OffCanvasRender.php
+++ b/core/modules/outside_in/src/Render/MainContent/OffCanvasRender.php
@@ -11,7 +11,7 @@
 use Symfony\Component\HttpFoundation\Request;
 
 /**
- * Default main content renderer for off_canvas dialog requests.
+ * Default main content renderer for off-canvas dialog requests.
  */
 class OffCanvasRender extends DialogRenderer {
 
diff --git a/core/modules/outside_in/src/Tests/Ajax/OffCanvasDialogTest.php b/core/modules/outside_in/src/Tests/Ajax/OffCanvasDialogTest.php
index 582ca17..41d66dd 100644
--- a/core/modules/outside_in/src/Tests/Ajax/OffCanvasDialogTest.php
+++ b/core/modules/outside_in/src/Tests/Ajax/OffCanvasDialogTest.php
@@ -21,7 +21,7 @@ class OffCanvasDialogTest extends AjaxTestBase {
   public static $modules = ['outside_in'];
 
   /**
-   * Test sending AJAX requests to open and manipulate off_canvas dialog.
+   * Test sending AJAX requests to open and manipulate off-canvas dialog.
    */
   public function testDialog() {
     $this->drupalLogin($this->drupalCreateUser(['administer contact forms']));
diff --git a/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php b/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php
index 0b0ceb9..d8c6339 100644
--- a/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php
+++ b/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php
@@ -37,7 +37,7 @@ public function thing2() {
   }
 
   /**
-   * Displays test links that will open in off_canvas tray.
+   * Displays test links that will open in off-canvas tray.
    *
    * @return array
    *   Render array with links.