diff --git a/CMakeLists.txt b/CMakeLists.txt
index c7ce097..2105548 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.21)
 
 project(cpp-rcp
-    VERSION 2.15.0
+    VERSION 2.15.1
     DESCRIPTION "Remote Control Protocol for automotive zonal architecture (C++)"
     HOMEPAGE_URL "https://github.com/SoundMatt/cpp-RCP"
     LANGUAGES CXX
diff --git a/ROADMAP.md b/ROADMAP.md
index 82d4770..7e93c9d 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -698,6 +698,35 @@ still not claimed — see this file's own disclaimer pattern in
 
 ### 52. Fragmentation — Go/No-Go Decision (v2.8.0)
 
+**Done (v2.15.1):** this milestone's call was made in prose (below) before
+any of its downstream consequences landed, and every one of those
+consequences was already built and cross-referencing "ROADMAP.md milestone
+52" as settled fact by the time this close-out PR was opened: the
+single-AVTPDU UART RX-FIFO/`read_size` bound in `rcp/uart.hpp`, the
+equivalent SPI framing note in `rcp/spi.hpp`, the CAN XL
+`kMaxXlPayloadSingleAvtpdu` vs. `kMaxXlPayloadSpec` split in `rcp/can.hpp`,
+the `ms` ("more segments") field comment in `rcp/acf.hpp` (`rcp/wire.hpp`
+at the time this close-out was first drafted; split into `rcp/avtp.hpp`/
+`rcp/acf.hpp` by the post-hoc naming reconciliation below, v2.7.1 — the
+`ms` field itself lives in the ACF message-format half, `rcp/acf.hpp`), and
+the `REQ-UART-006`/`REQ-CANEP-004` traceability entries in `.fusa-reqs.json`.
+This milestone formally closes the decision itself: the
+`kOptFragmentation` bit comment in `rcp/regmap.hpp` — the one remaining
+place in the tree still describing the call as "pending" — now reads
+consistently with the rest of the codebase (reserved, never set, per this
+already-decided no-go). This milestone's designated slot, `v2.8.0`, is the
+label used throughout the tree's forward references to this decision
+(`rcp/uart.hpp`, `rcp/spi.hpp`, `rcp/can.hpp`, `rcp/acf.hpp`,
+`rcp/avtp.hpp`, and this file's own milestone heading above) and is left
+unchanged for that reason, but it was never tagged — this close-out PR sat
+open while `main` moved through the v2.7.1 naming reconciliation and seven
+more milestones to v2.15.0 — so `rcp::kVersion`/the CMake project version
+move to `2.15.1` instead, an out-of-band patch bump on top of current
+`main` rather than the unavailable `2.8.0` slot, the same convention
+`v2.7.1` itself set for landing non-sequential, milestone-adjacent work.
+No wire-format, endpoint, or safety-mechanism behavior changes in this
+milestone — it is a documentation and version close-out only.
+
 **Decision: no-go for this cycle.** Fragmentation (the `ms`/`segment_num`
 mechanism for splitting one logical request/response across multiple
 AVTPDUs) is explicitly called out in the specification itself as optional
diff --git a/include/rcp/regmap.hpp b/include/rcp/regmap.hpp
index 9dabe69..3bf0940 100644
--- a/include/rcp/regmap.hpp
+++ b/include/rcp/regmap.hpp
@@ -251,7 +251,7 @@ struct ResponseQueueConfig {
 
 constexpr uint32_t kOptConditionalRequests = 0x0000'0001; // compound/triggered/timed/chained requests (v2.5.0)
 constexpr uint32_t kOptSafetyRequests      = 0x0000'0002; // E2E CRC safe points + safety-request variants (v2.6.0)
-constexpr uint32_t kOptFragmentation       = 0x0000'0004; // multi-segment requests (v2.8.0, go/no-go pending)
+constexpr uint32_t kOptFragmentation       = 0x0000'0004; // multi-segment requests — bit reserved, never set: ROADMAP.md milestone 52's already-decided fragmentation no-go (v2.8.0)
 
 // ── TablePointer ──────────────────────────────────────────────────────────────
 // The pointer/capacity pair pattern used for each of the five bootstrap
diff --git a/include/rcp/version.hpp b/include/rcp/version.hpp
index 2cf1d56..5e620e9 100644
--- a/include/rcp/version.hpp
+++ b/include/rcp/version.hpp
@@ -6,6 +6,6 @@
 namespace rcp {
 
 // Semantic version of the cpp-RCP implementation (matches the latest git tag).
-constexpr std::string_view kVersion = "2.15.0";
+constexpr std::string_view kVersion = "2.15.1";
 
 } // namespace rcp