diff --git a/src/main.zig b/src/main.zig
index 960a725..385c898 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -48,17 +48,14 @@ const log = std.log.scoped(.relay);
 pub const default_stack_size = 8 * 1024 * 1024;
 
 // -- Io backend selection --
-// Io.Evented (fibers on io_uring): ~35 threads instead of ~2,800 (one per PDS).
-// Networking via patched Uring.zig (patches/uring-networking.patch) — implements
-// listen, accept, connect, read, write, send via io_uring opcodes. DNS (netLookup)
-// is NOT patched; subscribers resolve hostnames through pool_io (Threaded) instead.
+// Io.Threaded: one OS thread per io.concurrent() call (~2,800 for PDS subscribers).
+// Higher thread count than Evented (~35) but proven stable at 99%+ coverage on 0.15.
 //
-// History: 28 commits of cross-Io fixes (see docs/evented-attempt.md). The
-// production SIGSEGV that prompted a brief Threaded revert turned out to be a
-// websocket handshake bug (TCP split mid-CRLF), not a fiber issue. Fixed in
-// websocket.zig 9ac64da. Evented + ReleaseSafe GPFs immediately on startup
-// (same as repro) — must build with ReleaseFast.
-const Backend = Io.Evented;
+// Evented (io_uring fibers) shelved: 8 crash classes from cross-Io violations,
+// ReleaseSafe GPF from fiber context-switch codegen bug, persistent ~10-15% coverage
+// degradation, zig team marks Evented as experimental. See docs/evented-attempt.md.
+// Can revisit when zig's Evented runtime matures.
+const Backend = Io.Threaded;
 
 var backend: Backend = undefined;
 var debug_threaded_io: Io.Threaded = undefined;