diff --git a/docs/DESIGN.md b/docs/DESIGN.md
index 6ab81344..4eb1c70b 100644
--- a/docs/DESIGN.md
+++ b/docs/DESIGN.md
@@ -2,7 +2,7 @@
 
 This is the **single source of truth** for every implementer. Research lives in `docs/research/` (start with `00-INDEX.md`; where a research file's body and its "Addendum (critic)" disagree, the addendum wins). When this document and research disagree, **this document wins**; when this document is silent, follow research; when both are silent, choose the simplest faithful behaviour and write it down in the module's header comment.
 
-Language: all player-facing text is **Simplified Chinese** (names/descriptions come from official data). Code, comments and identifiers are English.
+Language: player-facing text is **Simplified Chinese** by default, with an English switch since 0.2.0 (§25.2, docs/I18N.md: UI strings through `t('中文')`, game texts from the official Chinese data or the official EN client's). Code, comments and identifiers are English.
 
 Versions: the first public release was **0.1.0** (2026-10-02, the state of §0–§20.15); the releases after it add the player feedback and GitHub reports — 0.1.1 §21, 0.1.2 §22, 0.1.3 §23, 0.1.4 §24 — and **0.2.0** (`package.json`, `shared/constants.js APP_VERSION`; `CHANGELOG.md`) the maintainability refactor, two languages, 补位, 自选编队 and their fidelity work — §25 — and is the state described by this document. The labels v1 / v2 / v2.1–v2.5.2 in §0, §14–§20 and in the BALANCE / SIM comparisons name the design generations and the private playtest builds that came before it; they are kept as history.