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wcfs/internal/xbtree/δbtail.go

@@ -1193,6 +1193,8 @@ func (δBtail *ΔBtail) SliceByRootRev(root zodb.Oid, lo, hi zodb.Tid) (/*readon
 	// _ΔTtail.rebuild clones vδT before modifying it. This way the data we
 	// return to caller will stay unchanged even if rebuild is running
 	// simultaneously.
+	//
+	// XXX adjust the doc to refer to vδT RCU in overview?
 	return vδT[i:j+1]
 }