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diff --git a/CONTEXT.md b/CONTEXT.md
index ad9ce2d..c75e36c 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -307,6 +307,11 @@ vocabulary / decisions.
   VGUI additive material was invisible on NPCs.
 - Style materials are preloaded from `outer_draw` (throttled) and cached; the
   render hook never calls FindMaterial itself. A missing style uses solid.
+- Viewmodels are collated by the engine as `RENDER_GROUP_VIEW_MODEL_OPAQUE`,
+  so an additive forced material can wash out against a bright sky or wall
+  (and the engine may not treat the draw as translucent). Additive styles on
+  the viewmodel therefore draw a dim opaque solid base first, then the
+  additive pass; the first-person model never disappears.
 - Feature is off by default. Config sections: `[chams]` (active/bind),
   `[chams_hostile|neutral|friendly]` (`vis`, `vis_mat`, `vis_r/g/b`, `inv`,
   `inv_mat`, `inv_r/g/b`) and `[chams_vm]` (`on`, `mat`, `r/g/b`). The GUI has