diff --git a/gtk/gtksettings.c b/gtk/gtksettings.c
index e9c2c107f6..1aa52b6ff5 100644
--- a/gtk/gtksettings.c
+++ b/gtk/gtksettings.c
@@ -475,6 +475,9 @@ gtk_settings_class_init (GtkSettingsClass *class)
    * The type of subpixel antialiasing to use.
    *
    * The possible values are none, rgb, bgr, vrgb, vbgr.
+   *
+   * Note that GSK does not support subpixel antialiasing, and this
+   * setting has no effect on font rendering in GTK.
    */
   pspecs[PROP_XFT_RGBA] = g_param_spec_string ("gtk-xft-rgba", NULL, NULL,
                                                NULL,
diff --git a/testsuite/gsk/compare-render.c b/testsuite/gsk/compare-render.c
index b015f25b6a..c0148c873e 100644
--- a/testsuite/gsk/compare-render.c
+++ b/testsuite/gsk/compare-render.c
@@ -355,33 +355,36 @@ main (int argc, char **argv)
   if (!node)
     return 1;
 
-  /* Render the .node file and download to cairo surface */
-  rendered_texture = gsk_renderer_render_texture (renderer, node, NULL);
-  g_assert_nonnull (rendered_texture);
-
-  save_image (rendered_texture, node_file, ".out.png");
-
-  /* Load the given reference png file */
-  reference_texture = gdk_texture_new_from_filename (png_file, &error);
-  if (reference_texture == NULL)
+  if (plain)
     {
-      g_print ("Error loading reference surface: %s\n", error->message);
-      g_clear_error (&error);
+      /* Render the .node file and download to cairo surface */
+      rendered_texture = gsk_renderer_render_texture (renderer, node, NULL);
+      g_assert_nonnull (rendered_texture);
+
       save_image (rendered_texture, node_file, ".out.png");
-      return 0;
-    }
 
-  /* Now compare the two */
-  diff_texture = reftest_compare_textures (rendered_texture, reference_texture);
-  if (diff_texture)
-    {
-      save_image (diff_texture, node_file, ".diff.png");
-      g_object_unref (diff_texture);
-      success = FALSE;
-    }
+      /* Load the given reference png file */
+      reference_texture = gdk_texture_new_from_filename (png_file, &error);
+      if (reference_texture == NULL)
+        {
+          g_print ("Error loading reference surface: %s\n", error->message);
+          g_clear_error (&error);
+          save_image (rendered_texture, node_file, ".out.png");
+          return 0;
+        }
 
-  g_clear_object (&reference_texture);
-  g_clear_object (&rendered_texture);
+      /* Now compare the two */
+      diff_texture = reftest_compare_textures (rendered_texture, reference_texture);
+      if (diff_texture)
+        {
+          save_image (diff_texture, node_file, ".diff.png");
+          g_object_unref (diff_texture);
+          success = FALSE;
+        }
+
+      g_clear_object (&reference_texture);
+      g_clear_object (&rendered_texture);
+    }
 
   if (flip)
     {