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diff --git a/Documentation/ABI/removed/net_dma b/Documentation/ABI/removed/net_dma
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+What:           tcp_dma_copybreak sysctl
+Date:           Removed in kernel v3.13
+Contact:        Dan Williams <dan.j.williams@intel.com>
+Description:
+        Formerly the lower limit, in bytes, of the size of socket reads
+        that will be offloaded to a DMA copy engine.  Removed due to
+        coherency issues of the cpu potentially touching the buffers
+        while dma is in flight.