diff --git a/spec/index.bs b/spec/index.bs
index 0279e03e4b..db2323163e 100644
--- a/spec/index.bs
+++ b/spec/index.bs
@@ -630,7 +630,8 @@ Textures may consist of separate [=mipmap levels=] and [=array layers=],
 which can be used differently at any given time.
 Each such <dfn dfn>texture subresource</dfn> is uniquely identified by a
 [=texture=], [=mipmap level=], and
-(for {{GPUTextureDimension/2d}} textures only) [=array layer=].
+(for {{GPUTextureDimension/2d}} textures only) [=array layer=],
+and [=aspect=].
 
 We define <dfn dfn>subresource</dfn> to be either a whole buffer, or a [=texture subresource=].
 
@@ -638,10 +639,9 @@ We define <dfn dfn>subresource</dfn> to be either a whole buffer, or a [=texture
 Some [=internal usage=]s are compatible with others. A [=subresource=] can be in a state
 that combines multiple usages together. We consider a list |U| to be
 a <dfn dfn>compatible usage list</dfn> if (and only if) it satisfies any of the following rules:
-    - Each usage in |U| is [=internal usage/input=], [=internal usage/constant=], or [=internal usage/storage-read=].
+    - Each usage in |U| is [=internal usage/input=], [=internal usage/constant=], [=internal usage/storage-read=], or [=internal usage/attachment-read=].
     - Each usage in |U| is [=internal usage/storage=] or [=internal usage/storage-read=].
     - Each usage in |U| is [=internal usage/storage-write=].
-    - Each usage in |U| is [=internal usage/attachment-read=], [=internal usage/storage-read=], or [=internal usage/constant=].
     - |U| contains exactly one element: [=internal usage/attachment=].
 </div>
 
@@ -664,6 +664,8 @@ For example, binding the same buffer for [=internal usage/storage=] as well as f
 as well as the owning {{GPUCommandEncoder}} into the error state.
 This combination of usages does not make a [=compatible usage list=].
 
+Note: race condition of multiple writable storage buffer/texture usages in a single [=usage scope=] is allowed.
+
 The [=subresources=] of textures included in the views provided to
 {{GPURenderPassColorAttachmentDescriptor/attachment|GPURenderPassColorAttachmentDescriptor.attachment}} and
 {{GPURenderPassColorAttachmentDescriptor/resolveTarget|GPURenderPassColorAttachmentDescriptor.resolveTarget}}
@@ -1729,7 +1731,7 @@ interface GPUMapMode {
 
 Issue: define <dfn dfn>texture</dfn> (internal object)
 
-Issue: define <dfn dfn>mipmap level</dfn>, <dfn dfn>array layer</dfn>, <dfn dfn>slice</dfn> (concepts)
+Issue: define <dfn dfn>mipmap level</dfn>, <dfn dfn>array layer</dfn>, <dfn dfn>aspect</dfn>, <dfn dfn>slice</dfn> (concepts)
 
 ## <dfn interface>GPUTexture</dfn> ## {#texture-interface}