diff --git a/docs/orientation.md b/docs/orientation.md
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+---
+myst:
+  html_meta:
+    description lang=en: |
+      One-page orientation to the pccx documentation repository, including
+      the English and Korean source trees, release sections, and key entry
+      points for contributors.
+---
+
+# Repository Orientation
+
+This repository is the Sphinx documentation site for the pccx ecosystem.
+The active RTL is kept in companion repositories; this repo explains the
+architecture, ISA, driver surface, verification posture, release evidence,
+and reader-facing project tracks.
+
+## Documentation Structure
+
+The site is built from two parallel documentation roots:
+
+| Path | Role |
+|---|---|
+| `docs/` | English documentation. This is the canonical source for new content. |
+| `ko/docs/` | Korean documentation. This tree is produced by external translation tooling and may trail the English source. |
+| `index.rst` | English build root and sidebar toctree. It links the main reader sections. |
+| `ko/index.rst` | Korean build root and sidebar toctree. It mirrors the public section layout for the KO site. |
+| `conf_common.py` | Shared Sphinx configuration for both language builds. |
+| `conf.py`, `ko/conf.py` | Thin language-specific wrappers around the shared config. |
+
+When adding reader documentation, start in `docs/`. Keep path names stable
+where possible because cross-references, language switching, and published
+URLs depend on predictable EN/KO counterparts.
+
+## Key Sections
+
+| Section | Path | Purpose |
+|---|---|---|
+| Introduction | `docs/index.rst`, `docs/quickstart.md`, `docs/roadmap.md` | Project summary, reproducer path, and release-track direction. |
+| Evidence | `docs/Evidence/index.rst` | Measured-results posture and release evidence gates. |
+| v002 | `docs/v002/` | Active KV260 LLM architecture line. This is the primary technical reference. |
+| v002 Architecture | `docs/v002/Architecture/` | Top-level hardware design, dataflow, memory hierarchy, floorplan, and compute cores. |
+| v002 ISA | `docs/v002/ISA/` | 64-bit instruction encoding, instruction behavior, and dataflow notes. |
+| v002 RTL | `docs/v002/RTL/` | Source-oriented reference pages that link to the external SystemVerilog repository. |
+| v002 Drivers | `docs/v002/Drivers/` | HAL, API, and host software surface. |
+| v002 Models | `docs/v002/Models/` | Gemma-3N execution notes and model-specific mapping pages. |
+| Formal, Verification, Build | `docs/v002/Formal/`, `docs/v002/Verification/`, `docs/v002/Build/` | Sail model, verification status, and bitstream/build notes. |
+| Target Hardware | `docs/Devices/` | Device-specific pages, currently centered on KV260. |
+| pccx-lab Handbook | `docs/Lab/` | Trace, profiler, workflow facade, analyzer API, CLI, IPC, and verification workflow documentation. |
+| Future Tracks | `docs/v003/`, `docs/vision-v001/` | Placeholders for the next LLM line and a parallel vision workload line. |
+| Archive | `docs/archive/` | Historical v001 documentation retained for reference. |
+| Toolchain Demos | `docs/samples/` | Mermaid, WaveDrom, SVG, and plotting examples for the docs toolchain. |
+| Releases | `docs/releases/` | Release notes and published release summaries. |
+
+## Source Of Truth
+
+Treat the English docs as the edited documentation source. For v002 RTL
+facts, the SystemVerilog package and modules in
+`pccx-FPGA-NPU-LLM-kv260` win over this repository. Documentation tables,
+instruction widths, opcodes, and enums should be copied from RTL into the
+docs, not inferred in the opposite direction.
+
+For public claims, prefer pages that carry explicit evidence gates. The
+roadmap can describe planned tracks, but throughput, timing, and board-run
+numbers should land only after the evidence page and release checklist can
+support them.
+
+## Build And Review Entry Points
+
+Use `make en` for a quick English build, `make ko` for the translated tree,
+and `make strict` before declaring documentation work complete. Use
+`make lint` for sphinx-lint and codespell checks, and reserve
+`make linkcheck` for link-heavy changes or release preparation.
+
+Before editing diagrams or plots, follow the project-specific figure rules:
+new diagrams live under `_static/diagrams/`, plots live under `plots/`,
+and generated outputs should stay reproducible from source.
diff --git a/index.rst b/index.rst
index e09d1b39e..1800c754b 100644
--- a/index.rst
+++ b/index.rst
@@ -109,6 +109,7 @@ Tooling & Lab
    :caption: Introduction
 
    docs/index
+   docs/orientation
    docs/quickstart
    docs/Evidence/index
    docs/roadmap