diff --git a/doc/internals/muxes.svg b/doc/internals/muxes.svg
index 091c5b0..3feaa4d 100644
--- a/doc/internals/muxes.svg
+++ b/doc/internals/muxes.svg
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 <text xml:space="preserve" x="0" y="0" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="168" text-anchor="middle">application</text>
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-<text xml:space="preserve" x="12900" y="75" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">Notes:</text>
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-<text xml:space="preserve" x="13125" y="2250" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">is cs-&gt;data and cs-&gt;data_cb</text>
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-<text xml:space="preserve" x="12975" y="2550" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">- transport layers (xprt) are</text>
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 <text xml:space="preserve" x="12225" y="10725" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="end">xprt-&gt;subscribe(SUB_SEND)</text>
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+<text xml:space="preserve" x="0" y="0" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="168" text-anchor="middle">stconn</text>
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+<text xml:space="preserve" x="0" y="0" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="middle">(eg: checks, streams)</text>
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+<text xml:space="preserve" x="0" y="0" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="168" text-anchor="middle">connection = sc-&gt;sedesc-&gt;conn</text>
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+<text xml:space="preserve" x="12225" y="225" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">Notes:</text>
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+<text xml:space="preserve" x="12975" y="675" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">snd_buf() will move the</text>
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+<text xml:space="preserve" x="12975" y="975" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">buffer (zero-copy) when</text>
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+<text xml:space="preserve" x="12975" y="1275" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">the destination is empty.</text>
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+<text xml:space="preserve" x="12825" y="1650" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">- the application is also</text>
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+<text xml:space="preserve" x="12975" y="2250" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">is sc-&gt;app with sc-&gt;app_ops</text>
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+<text xml:space="preserve" x="12825" y="2550" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">- transport layers (xprt) are</text>
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+<text xml:space="preserve" x="12975" y="2775" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">stackable. conn-&gt;xprt is</text>
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+<text xml:space="preserve" x="12975" y="3000" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">the topmost one.</text>
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+<text xml:space="preserve" x="12975" y="1950" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">called the app layer and</text>
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+<text xml:space="preserve" x="12825" y="375" fill="#000000" font-family="AvantGarde" font-style="normal" font-weight="normal" font-size="144" text-anchor="start">- mux-&gt;rcv_buf() and</text>
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