.

wcfs/wcfs.go

@@ -1456,8 +1456,8 @@ func (wlink *WatchLink) setupWatch(ctx context.Context, foid zodb.Oid, at zodb.T
 	// f.watches; if w ∉ f.watches at that moment, w will miss to receive
 	// pin for #3.
 	//
-	// NOTE for `unpin blk` head we can be sure there won't be simultaneous
-	// `pin blk` request, because:		XXX recheck
+	// NOTE for `unpin blk` to -> @head we can be sure there won't be
+	// simultaneous `pin blk` request, because:		XXX recheck
 	//
 	// - unpin means blk was previously pinned,
 	// - blk was pinned means it is tracked by δFtail,

wcfs/wcfs_test.py

@@ -903,8 +903,8 @@ def watch(twlink, zf, at, pinok=None): # -> tWatch
         #
         # FIXME
         #
-        #     δ(accessed)     δ(not-accessed)
-        #   ----x----------------o-----------------]-----
+        #       δ  accessed      δ  not-accessed
+        #   ----x-------x--------x-----o-----------]-----
         #      at_prev          at               head
         #
         # -> must pin to at? (not unpin @head)