diff --git a/Documentation/gpu/drm-mm.rst b/Documentation/gpu/drm-mm.rst
index 3da81b7..66d24b7 100644
--- a/Documentation/gpu/drm-mm.rst
+++ b/Documentation/gpu/drm-mm.rst
@@ -43,6 +43,15 @@
 .. kernel-doc:: drivers/gpu/drm/ttm/ttm_device.c
    :export:
 
+TTM resource object reference
+-----------------------------
+
+.. kernel-doc:: include/drm/ttm/ttm_resource.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/ttm/ttm_resource.c
+   :export:
+
 The Graphics Execution Manager (GEM)
 ====================================
 
diff --git a/include/drm/ttm/ttm_resource.h b/include/drm/ttm/ttm_resource.h
index 32c5edd..5952051 100644
--- a/include/drm/ttm/ttm_resource.h
+++ b/include/drm/ttm/ttm_resource.h
@@ -103,10 +103,7 @@ struct ttm_resource_manager_func {
  * struct ttm_resource_manager
  *
  * @use_type: The memory type is enabled.
- * @flags: TTM_MEMTYPE_XX flags identifying the traits of the memory
- * managed by this memory type.
- * @gpu_offset: If used, the GPU offset of the first managed page of
- * fixed memory or the first managed location in an aperture.
+ * @use_tt: If a TT object should be used for the backing store.
  * @size: Size of the managed region.
  * @func: structure pointer implementing the range manager. See above
  * @move_lock: lock for move fence
@@ -144,6 +141,7 @@ struct ttm_resource_manager {
  * @addr:		mapped virtual address
  * @offset:		physical addr
  * @is_iomem:		is this io memory ?
+ * @caching:		See enum ttm_caching
  *
  * Structure indicating the bus placement of an object.
  */