diff --git a/examples/cuda-fanout/gpu-worker.lsp b/examples/cuda-fanout/gpu-worker.lsp
index 07b27c8..23fa1c3 100644
--- a/examples/cuda-fanout/gpu-worker.lsp
+++ b/examples/cuda-fanout/gpu-worker.lsp
@@ -35,12 +35,15 @@
   ;; Override via env or per host.
   "./shake256-fanout")
 
-;; demo_ops lives in the foxhop ecdsa repo and runs upstream-format
+;; bend-cuda lives in the foxhop ecdsa repo and runs upstream-format
 ;; ops.bin against the CPU+GPU simulators, writing (cuda-sim-result …)
 ;; portals via --portal. No daemon mode: spawn-per-call.
+;; BEND_CUDA env override > legacy DEMO_OPS env > default bend-cuda path
+;; > legacy demo_ops symlink (still in place during the rename transition).
 (define *binary-demo-ops*
-  (or (get-environment-variable "DEMO_OPS")
-      "/home/fox/git/www.foxhop.net/ecdsa/cuda/demo_ops"))
+  (or (get-environment-variable "BEND_CUDA")
+      (get-environment-variable "DEMO_OPS")
+      "/home/fox/git/www.foxhop.net/ecdsa/cuda/bend-cuda"))
 
 ;; cgbn-batch-worker — bend form B. CGBN bignum batch over BSHK protocol;
 ;; daemon mode mirrors shake256-fanout.cu (process-bin <in> <out>).
@@ -198,7 +201,7 @@
 ;;; -- op handler -- cuda-sim-ops-bin -----------------------------
 ;;;
 ;;; Request: (cuda-sim-ops-bin <ops-bin-path> <n-batches>)
-;;; Spawns demo_ops <path> <n-batches> --portal <tmp>, drains its
+;;; Spawns bend-cuda <path> <n-batches> --portal <tmp>, drains its
 ;;; stdout to EOF (process exit), reads the portal, returns the
 ;;; parsed (cuda-sim-result ...) form unchanged so callers can pull
 ;;; out gates / phase / timings.
@@ -216,7 +219,7 @@
 ;; Walks (a b c ...) looking for (name <number>); returns #f if missing.
 (define (portal-find-number form name)
   ;; Guard: form may arrive as #f when read-from-string sees an empty
-  ;; or malformed portal file (demo_ops crashed mid-write, OOM, etc).
+  ;; or malformed portal file (bend-cuda crashed mid-write, OOM, etc).
   ;; A bare (cdr #f) here historically crashed the gpu-worker with
   ;; "error: not a pair: #f", taking the port-8320 listener down.
   (cond
@@ -263,7 +266,7 @@
                           (number->string n-batches)
                           "--portal" portal-path))
               (pair (spawn-process-stdio *binary-demo-ops* argv)))
-         ;; demo_ops does not read stdin; drain stdout until exit.
+         ;; bend-cuda does not read stdin; drain stdout until exit.
          (drain-to-eof (cdr pair))
          (close-port (car pair))
          (close-port (cdr pair))