diff --git a/doc/internals/list.fig b/doc/internals/list.fig
new file mode 100644
index 0000000..dc1f4dc
--- /dev/null
+++ b/doc/internals/list.fig
@@ -0,0 +1,698 @@
+#FIG 3.2
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+4 1 0 50 0 14 10 0.0000 4 135 3240 5805 4950 Asymmetrical list starting at R(red)\001
+4 0 0 50 0 12 10 0.0000 4 135 3780 7875 5715 - FOREACH_ITEM(it, R, end, struct foo*, L)\001
+4 0 0 50 0 12 10 0.0000 4 105 2610 7875 5490 - last element has R->P == &L\001
+4 1 0 50 0 14 10 0.0000 4 135 3510 10215 4950 Symmetrical lists vs Asymmetrical lists\001
+4 0 0 50 0 12 10 0.0000 4 135 4680 7875 6165 - FOREACH_ITEM_SAFE(it, bck, R, end, struct foo*, L)\001
+4 0 0 50 0 12 10 0.0000 4 135 4500 7875 6390   does the same except that <bck> allows to delete\001
+4 0 0 50 0 12 10 0.0000 4 135 2340 7875 6570   any node, including <it>\001
+4 1 0 50 0 12 10 0.0000 4 135 450 5130 5355 foo_0\001
+4 1 0 50 0 12 10 0.0000 4 135 450 6030 5355 foo_1\001
+4 1 0 50 0 12 10 0.0000 4 135 450 6930 5355 foo_2\001
+4 1 0 50 0 14 10 0.0000 4 135 3150 2070 4950 Symmetrical list starting at R(red)\001
+4 1 0 50 0 12 10 0.0000 4 135 450 3195 5355 foo_2\001
+4 1 0 50 0 12 10 0.0000 4 135 450 2295 5355 foo_1\001
+4 1 0 50 0 12 10 0.0000 4 135 450 1395 5355 foo_0\001
+4 1 0 50 0 12 10 0.0000 4 105 270 9855 3420 foo\001
+4 1 0 50 0 12 10 0.0000 4 90 90 9990 3825 E\001
+4 1 0 50 0 12 10 0.0000 4 135 2520 4905 3015 Replaces W with Y, returns W\001
+4 1 0 50 0 14 10 0.0000 4 135 1440 7785 2655 Linking elements\001
+4 1 0 50 0 12 10 0.0000 4 135 450 8235 3015 foo_1\001
+4 1 0 50 0 12 10 0.0000 4 135 450 7335 3015 foo_0\001
+4 1 0 50 0 12 10 0.0000 4 135 3060 7425 810 adds Y(yellow) just after G(green)\001
+4 1 0 50 0 12 10 0.0000 4 135 1170 4500 855 adds W(white)\001
+4 1 0 50 0 12 10 0.0000 4 135 2700 10755 810 adds Y at the queue (before G)\001
+4 1 0 50 0 12 12 0.0000 4 165 630 990 1080 P=prev\001
+4 1 0 50 0 14 12 0.0000 4 135 1155 945 585 struct list\001
+4 1 0 50 0 12 12 0.0000 4 120 630 990 855 N=next\001
+4 1 0 50 0 12 10 0.0000 4 105 1080 2565 900 Terminates G\001
+4 1 0 50 0 14 10 0.0000 4 105 1260 2565 675 struct list *G\001
+4 1 0 50 0 14 10 0.0000 4 135 1260 2565 495 LIST_INIT(G):G\001
+4 1 0 50 0 14 10 0.0000 4 135 1350 4500 495 LIST_ADD(G,W):W\001
+4 1 0 50 0 14 10 0.0000 4 135 1440 4500 675 LIST_ADDQ(G,W):W\001
+4 1 0 50 0 14 10 0.0000 4 135 1350 7425 540 LIST_ADD(G,Y):Y\001
+4 1 0 50 0 14 10 0.0000 4 135 1440 10755 540 LIST_ADDQ(G,Y):Y\001
+4 1 0 50 0 12 10 0.0000 4 135 2610 1755 3060 unlinks and returns Y(yellow)\001
+4 1 0 50 0 14 10 0.0000 4 135 1170 1755 2790 LIST_DEL(Y):Y\001
+4 1 0 50 0 14 10 0.0000 4 135 1440 4905 2745 LIST_RIWI(W,Y):W\001
+4 1 0 50 0 12 10 0.0000 4 135 2790 10665 3105 containing header E as member L\001
+4 1 0 50 0 14 10 0.0000 4 135 2880 10665 2700 foo=LIST_ELEM(E, struct foo*, L)\001
+4 1 0 50 0 12 10 0.0000 4 135 2880 10665 2925 Returns a pointer to struct foo*\001
+4 0 0 50 0 12 10 0.0000 4 135 2610 7875 5265 - both are empty if R->P == R\001
+4 0 0 50 0 12 10 0.0000 4 135 3960 7875 5940   iterates <it> through foo{0,1,2} and stops\001