diff --git a/docs/research/2026-08-11-fa-panel-structure.md b/docs/research/2026-08-11-fa-panel-structure.md
index 06f31378..a10c86ed 100644
--- a/docs/research/2026-08-11-fa-panel-structure.md
+++ b/docs/research/2026-08-11-fa-panel-structure.md
@@ -897,6 +897,24 @@ identities:
 TABLE property (0x2E) read to pin exactly — one fixture dump closes it,
 same as U3.)
 
+**[FA3 addendum, 2026-08-12: the x-order guess above is WRONG.** The FA3
+fixture dump (`social_panel_2100006E_1000018F.json`) and its live-mount
+probe (`SocialPanelLiveMountProbeTests`) read the real authored `0x2E` tab
+table, corroborated independently by each BUTTON's own resolved caption
+and each PAGE's own `P0x57` property (which lines up with the real F3/F4
+`ToggleAllegiancePanel`/`ToggleFellowshipPanel` ActionMap ids on the
+Allegiance/Fellowship pages specifically — a fact this table's own x-order
+guess had no way to check). The real pairing:
+```
+button 0x1000028C ("Allegiance") -> page 0x10000291 (Allegiance)  DEFAULT
+button 0x1000028E ("Fellowship") -> page 0x10000292 (Fellowship)
+button 0x10000512 ("Friends")    -> page 0x10000513 (Friends)
+button 0x1000053B ("Squelch")    -> page 0x1000054A (Squelch)
+```
+The panel's authored default tab is **Allegiance**, not Friends. See
+`src/AcDream.App/UI/Layout/SocialPanelController.cs`'s own class doc for
+the full citation.]**
+
 Every lane-C allegiance element id is CONFIRMED present under page
 `0x10000291`: swear `0x10000263` / break `0x10000264` / kick `0x10000265`
 (three 88×33 buttons at y=562), vassal ListBox `0x10000260` (Type 5,