diff --git a/features/extra-image-generation.feature b/features/extra-image-generation.feature
index 13c0952..1759186 100644
--- a/features/extra-image-generation.feature
+++ b/features/extra-image-generation.feature
@@ -15,6 +15,25 @@ Feature: Extra image generation
     And the file "_site/assets/resized/everybody-loves-jalapeño-pineapple-cornbread-100x50.png" should exist
     And the file "_site/assets/resized/progressive-100x50.jpeg" should exist
 
+  Scenario: Specifying a recursive glob pattern
+    Given I have a responsive_image configuration with:
+      """
+        sizes:
+          - width: 100
+        extra_images:
+          - assets/**/*
+      """
+    And I have a file "index.html" with "Hello, world!"
+    When I run Jekyll
+    Then the image "assets/resized/everybody-loves-jalapeño-pineapple-cornbread-100x50.png" should have the dimensions "100x50"
+    And the image "assets/resized/exif-rotation-100x50.jpeg" should have the dimensions "100x50"
+    And the image "assets/resized/progressive-100x50.jpeg" should have the dimensions "100x50"
+    And the image "assets/resized/test-100x50.png" should have the dimensions "100x50"
+    And the file "_site/assets/resized/everybody-loves-jalapeño-pineapple-cornbread-100x50.png" should exist
+    And the file "_site/assets/resized/exif-rotation-100x50.jpeg" should exist
+    And the file "_site/assets/resized/progressive-100x50.jpeg" should exist
+    And the file "_site/assets/resized/test-100x50.png" should exist
+
   Scenario: Honouring Jekyll 'source' configuration
     Given I have copied my site to "sub-dir/my-site-copy"
     And I have a configuration with: