diff --git a/quest/m1/README.md b/quest/m1/README.md
index 93cb6d3458..141e5cdedf 100644
--- a/quest/m1/README.md
+++ b/quest/m1/README.md
@@ -50,6 +50,7 @@ transport, benchmark tooling); worktrees isolate commits, not semantics.
 - [In-band auth](/quest/m1/auth/README.md) - a session tells its peer what it may publish and subscribe to, unions tokens presented in band, and fails loud on an out-of-scope publish
 - [Decoded frame ownership](/quest/m1/decoded-frames.md) - retain moq-video Frames across bindings, with native views or CPU conversion as needed
 - [C++ through moq-ffi](/quest/m1/cpp/README.md) - generated C++ over moq-ffi with futures and expected-style errors, shipped as a tarball, vcpkg, and Conan, and adopted by the OBS plugin
+- [moq-c](/quest/m1/moq-c.md) - libmoq ships as `moq-c`, beside `moq-cpp`, with its C header and library unchanged
 - [OBS native codecs](/quest/m1/obs-moq-video/README.md) - remove FFmpeg decoding dependencies, deliver GPU frames, and use native audio/video encoders
 - [Audio codecs](/quest/m1/audio-codecs/README.md) - platform audio codecs, explicit unsupported cases, and channel layouts up to 7.1
 - [Opus descriptions](/quest/m1/audio-opus-input.md) - validate headers and honor codec clock, pre-skip, and gain
diff --git a/quest/m1/moq-c.md b/quest/m1/moq-c.md
new file mode 100644
index 0000000000..608a5bfcb7
--- /dev/null
+++ b/quest/m1/moq-c.md
@@ -0,0 +1,33 @@
+# [M] libmoq becomes moq-c
+
+## Goal
+
+The C bindings ship as `moq-c`, matching `moq-cpp` and the other bindings: the
+crate, its directory, release tags, CMake package, and pkg-config file all use
+the name. C code and link lines do not change: the header stays `moq.h` and the
+library file keeps its current name. The published `libmoq` crate gets one last
+release that points users at `moq-c`.
+
+## Plan
+
+- Rename the crate `libmoq` to `moq-c` (`rs/libmoq` to `rs/moq-c`), its release
+  tags from `libmoq-v*` to `moq-c-v*`, and its workflow. The CMake package
+  becomes `find_package(moq-c)` and the pkg-config file `moq-c.pc`. The C++
+  package is already `moq-cpp` (#4187), so the two install side by side.
+- Keep the `[lib] name` so the library file and `moq.h` are unchanged.
+- A published package rename is a break, so this lands on `dev`. Release
+  tooling (release-plz, alert and nightly workflows, cachix) must follow the
+  new name and tag; check every workflow that names libmoq.
+- Update every consumer and reference: `cpp/obs` (`find_package`), interop
+  clients, `doc/lib/c`, `doc/bin/obs.md`, the root `CLAUDE.md` Cross-Package
+  Sync table, and quests that name libmoq. Grep the whole repository.
+- Publish a final `libmoq` release whose README and description point at
+  `moq-c`, then stop publishing it. The maintainer cuts releases; the PR only
+  prepares it.
+
+Public API: the C ABI is unchanged; the crate, package, and tag names change.
+Wire: none.
+
+## Related
+
+- [C++ through moq-ffi](/quest/m1/cpp/README.md) - the `moq-cpp` package this name mirrors