diff --git a/doc/internals/muxes.fig b/doc/internals/muxes.fig
new file mode 100644
index 0000000..23f82e5
--- /dev/null
+++ b/doc/internals/muxes.fig
@@ -0,0 +1,402 @@
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+4 1 0 49 -1 4 14 1.5708 4 180 2820 450 9450 connection = cs->conn\001
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+4 0 0 49 -1 4 12 1.5708 4 180 2820 2850 3225 mux->subscribe(SUB_RECV)\001
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+4 2 0 49 -1 4 12 0.0000 4 195 1845 12150 10125 tasklet_wakeup()\001
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+4 1 0 49 -1 4 12 0.0000 4 165 3465 8400 2100 HTX contents when mode==HTTP\001
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+4 1 38 48 -1 4 12 0.0000 4 165 735 5325 5250 decode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 7200 5250 decode\001
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+4 0 0 49 -1 4 12 1.5708 4 180 2835 12075 3225 mux->subscribe(SUB_SEND)\001
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+4 1 0 49 -1 4 14 1.5708 4 150 2145 450 6750 mux=conn->mux\001
+4 1 0 49 -1 4 14 1.5708 4 180 1590 450 2550 conn_stream\001
+4 0 0 49 -1 4 12 0.0000 4 150 660 12900 75 Notes:\001
+4 0 0 49 -1 4 12 0.0000 4 180 2175 12975 375 - mux->rcv_buf() and\001
+4 0 0 49 -1 4 12 0.0000 4 195 2475 12975 1650 - the application is also\001
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+4 0 0 49 -1 4 12 0.0000 4 195 2940 12975 2550 - transport layers (xprt) are\001
+4 0 0 49 -1 4 12 0.0000 4 195 2520 13125 2775 stackable. conn->xprt is\001
+4 0 0 49 -1 4 12 0.0000 4 195 1770 13125 3000 the topmost one.\001
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+4 0 0 49 -1 4 12 0.0000 4 195 2895 7050 12000 general processing function\001
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+4 2 0 49 -1 4 12 0.0000 4 195 2850 12225 10725 xprt->subscribe(SUB_SEND)\001
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