diff --git a/oldhero/README.md b/oldhero/README.md
new file mode 100644
index 00000000..ce65dcfe
--- /dev/null
+++ b/oldhero/README.md
@@ -0,0 +1,25 @@
+# oldhero — the Go-era kvlang
+
+This directory holds the **original Go implementation** of kvlang (back when it
+was still called dxlang). It was the first working end-to-end system: parser,
+lower, symbol, rwir, kvcpu, vthread, keytree, the rwir extension host, and an
+early stdlib — the whole pipeline, in Go.
+
+```
+ast/  cmd/  keytree/  kvcpu/  layout/  logx/  lower/
+parser/  rwir/  rwirext/  stdlib/  symbol/  vthread/
+```
+
+## Status: archived, frozen
+
+The live implementation has moved on and now lives at the repository root:
+
+- **layout** — a Rust crate (`layout/`) producing `libkvlanglayout.so` + `kvlanglayout`
+- **runtime** — C (`runtime/`) producing `libkvlang_runtime.so`, driven by the
+  Rust binary `kvlang`
+
+This Go version is kept **only as a memorial to the old hero** that carried the
+project through its first era. It is **not maintained and will not be updated**.
+For anything current — language behavior, the KV-tree model, the two-stage
+layout/runtime split — refer to the root implementation and `stdlib/kvlang`, not
+this directory.
diff --git a/stdlib/kvlang/deepdive/kvspace/05-key-system-and-array-access.kv b/stdlib/kvlang/deepdive/kvspace/05-key-system-and-array-access.kv
index f781a502..5a346e1f 100644
--- a/stdlib/kvlang/deepdive/kvspace/05-key-system-and-array-access.kv
+++ b/stdlib/kvlang/deepdive/kvspace/05-key-system-and-array-access.kv
@@ -55,8 +55,8 @@ kvspace 路径系统有 `/`（层级目录）与 `·`（成员目录）两个索
 kindexp ::= kind                   # 标量
          |  '*' kindexp            # 指针/软链接（body = 目标 key 路径）
          |  '@' kindexp            # 扩展存储句柄（body = 位置信息，data 在扩展存储）
-         |  '[' ']' kindexp        # 变长数组（字面量初始化→compact；裸声明→散 key）
-         |  '[' dims ']' kindexp   # 定长/多维数组（一个 XValue，连续 body）
+         |  '[' ']' kindexp        # 变长一维数组类型；compact/stringkeymap 由初始化括号（[...]/{...}）定
+         |  '[' dims ']' kindexp   # 定长/多维数组（compact 形态，单 XValue 连续 body）
 dims    ::= INT (',' INT)*
 kind    ::= uint8 | int8 | int16 | uint16 | int32 | uint32 | int64 | uint64
          |  float32 | float64 | bool | char/utf32 | char/utf8 | char/ascii | time | duration