diff --git a/CLAUDE.md b/CLAUDE.md
index 554818a..289a778 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -53,8 +53,8 @@ Do not capture PII, tokens, or secrets in OTel attributes or logs. Record instru
 *DevTrail | [Strange Days Tech](https://strangedays.tech) — Because every change tells a story.*
 
 ## Active Technologies
-- Rust (edition 2024, MSRV to be determined by tree-sitter 0.25 requirements) + tree-sitter 0.25, serde (serialization), 10 tree-sitter grammar crates (see research.md) (001-code-metrics-library)
+- Rust (edition 2024, MSRV to be determined by tree-sitter 0.25 requirements) + tree-sitter 0.25, serde (serialization), 12 tree-sitter grammar crates (10 Tier 1 + Kotlin, Swift) (001-code-metrics-library)
 - N/A (pure computation library, reads files via `std::fs`) (001-code-metrics-library)
 
 ## Recent Changes
-- 001-code-metrics-library: Added Rust (edition 2024, MSRV to be determined by tree-sitter 0.25 requirements) + tree-sitter 0.25, serde (serialization), 10 tree-sitter grammar crates (see research.md)
+- 001-code-metrics-library: Added Kotlin and Swift (Tier 2) via tree-sitter-kotlin-ng 1.1 and tree-sitter-swift 0.7, expanding to 12 languages
diff --git a/README.md b/README.md
index 009fdd2..e534e61 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Multi-language code complexity metrics powered by [tree-sitter](https://tree-sit
 
 Arborist computes **cognitive complexity** (SonarSource), **cyclomatic complexity**
 (McCabe), and **source lines of code** (SLOC) for functions and methods across
-10 programming languages -- all from a single, embeddable Rust library.
+12 programming languages -- all from a single, embeddable Rust library.
 
 ## Supported Languages
 
@@ -20,6 +20,8 @@ Arborist computes **cognitive complexity** (SonarSource), **cyclomatic complexit
 | C++ | `cpp` | `.cpp`, `.cc`, `.cxx`, `.hpp`, `.hxx`, `.hh` |
 | C | `c` | `.c`, `.h` |
 | PHP | `php` | `.php` |
+| Kotlin | `kotlin` | `.kt`, `.kts` |
+| Swift | `swift` | `.swift` |
 
 ## Installation
 
@@ -38,7 +40,7 @@ Select specific languages to reduce compile time:
 arborist = { version = "0.1", default-features = false, features = ["rust", "python"] }
 ```
 
-Enable all 10 languages:
+Enable all 12 languages:
 
 ```toml
 [dependencies]
@@ -50,7 +52,7 @@ arborist = { version = "0.1", features = ["all"] }
 | Flag | Includes |
 |------|----------|
 | `default` | `rust`, `python`, `javascript`, `typescript`, `java`, `go` |
-| `all` | All 10 Tier 1 languages |
+| `all` | All 12 languages (Tier 1 + Tier 2) |
 | Individual | One language each (e.g., `rust`, `python`, `csharp`) |
 
 ## Quick Start
diff --git a/specs/001-code-metrics-library/quickstart.md b/specs/001-code-metrics-library/quickstart.md
index 5b8fc33..e10c6f2 100644
--- a/specs/001-code-metrics-library/quickstart.md
+++ b/specs/001-code-metrics-library/quickstart.md
@@ -18,7 +18,7 @@ arborist = "0.1"
 [dependencies]
 arborist = { version = "0.1", default-features = false, features = ["rust", "python"] }
 
-# Or all 10 Tier 1 languages
+# Or all 12 languages (Tier 1 + Tier 2)
 [dependencies]
 arborist = { version = "0.1", features = ["all"] }
 ```
@@ -104,7 +104,7 @@ Per the project constitution, development follows test-first, fixture-driven wor
 | Flag | Languages |
 |------|-----------|
 | `default` | Rust, Python, JavaScript, TypeScript, Java, Go |
-| `all` | All 10 Tier 1 languages |
+| `all` | All 12 languages (Tier 1 + Tier 2) |
 | `rust` | Rust only |
 | `python` | Python only |
 | `javascript` | JavaScript + JSX |
@@ -115,3 +115,5 @@ Per the project constitution, development follows test-first, fixture-driven wor
 | `c` | C |
 | `go` | Go |
 | `php` | PHP |
+| `kotlin` | Kotlin + Kotlin Script |
+| `swift` | Swift |