diff --git a/docs/IMPLEMENTATION-PLAN.md b/docs/IMPLEMENTATION-PLAN.md
index 48187fc..0baffaf 100644
--- a/docs/IMPLEMENTATION-PLAN.md
+++ b/docs/IMPLEMENTATION-PLAN.md
@@ -130,3 +130,4 @@ The **how** behind each milestone is documented self-containedly in
 | Monaco setup, Vega-Lite schema service, editor patterns mined from vega/editor | [08 · Vega Editor Techniques](architecture/08-vega-editor-techniques.md)          |
 | Design language: tokens, type, spacing, color roles, components, themes        | [09 · Visual Design Language](architecture/09-visual-design.md)                   |
 | Interaction & feedback: toasts, busy states, empty states, council resolutions | [10 · Interaction & Feedback](architecture/10-interaction-and-feedback.md)        |
+| Learning section `/learn/`: markdown lessons, before/after spec progressions   | [11 · Learning Section](architecture/11-learning-section.md)                      |