diff --git a/qma_coulomb_hardness_v2.txt b/qma_coulomb_hardness_v2.txt
index c1e7ef4..279abaf 100644
--- a/qma_coulomb_hardness_v2.txt
+++ b/qma_coulomb_hardness_v2.txt
@@ -564,6 +564,19 @@ along the edge from L to R. In this frame:
   POSITIVE EDGE (J > 0):  center pair A_e = (8,0), B_e = (9,0).
   NEGATIVE EDGE (J < 0):  center pair A_e = (8.5,0), B_e = (8.5,1).
 
+PICTURE (topology only, not to scale):
+
+  J > 0:    L  ~~~  A_e === B_e  ~~~  R
+  J < 0:    L  ~~~  A_e  ~~~  R
+                      |
+                     B_e
+
+  ~~~ = one bent nine-link path (length 8 or 8.5; drawn zig-zag so that
+        off-path sites stay >= 1.4 apart)
+  === = the central unit-length bond A_e--B_e
+  L, R = the two ORIGINAL lattice vertices, 17 apart
+  A_e, B_e = the FRESH singlet-pair sites from Section 6
+
 The central bond A_e--B_e has length 1 in each case. The two spokes are
 nine-link paths of length nine each:
   positive edge: L to A_e and B_e to R;