diff --git a/resources/recipes/physics_world.recipe b/resources/recipes/physics_world.recipe
index 0e3f408f6a..87425e2b54 100644
--- a/resources/recipes/physics_world.recipe
+++ b/resources/recipes/physics_world.recipe
@@ -10,6 +10,7 @@ class PhysicsWorld(BasicNewsRecipe):
     oldest_article = 7
     max_articles_per_feed = 100
     no_stylesheets        = True
+    cover_url = 'http://images.iop.org/cws/icons/themes/phw/header-logo.png'
     use_embedded_content  = False
     remove_javascript     = True
     needs_subscription = True
diff --git a/src/calibre/devices/misc.py b/src/calibre/devices/misc.py
index a375df5694..c1a2ee66da 100644
--- a/src/calibre/devices/misc.py
+++ b/src/calibre/devices/misc.py
@@ -66,5 +66,6 @@ class AVANT(USBMS):
     VENDOR_NAME = 'E-BOOK'
     WINDOWS_MAIN_MEM = 'READER'
 
-    EBOOK_DIR_MAIN = 'E-books'
+    EBOOK_DIR_MAIN = ''
+    SUPPORTS_SUB_DIRS = True