diff --git a/implementations/main.cpp b/implementations/main.cpp
index 36c2a3c..1a09b32 100644
--- a/implementations/main.cpp
+++ b/implementations/main.cpp
@@ -1232,6 +1232,10 @@ public:
                         lastAccepted = enrol.Accepted();
                         onStage(enrol.Accepted(), enrol.Total());
                     } else {
+                        // The press produced a touch the trustlet did not turn
+                        // into a sample: too close to the previous position,
+                        // below the coverage or quality threshold, or outside
+                        // the overlap band.
                         onRetry();
                     }
                     pressHadTouch = false;
@@ -1596,12 +1600,18 @@ private:
                 auto o = session_.Enrol(
                     j.uid, cancel_,
                     [&](int accepted, int total) {
-                        (void)accepted; (void)total;
+                        // Logged as well as signalled. A run whose refusals
+                        // exist only as D-Bus traffic cannot be counted from
+                        // the transcript afterwards -- and a grep for them
+                        // returning nothing was read once as "the thresholds
+                        // refused nothing", which was wrong.
+                        std::println("  enrol: sample ACCEPTED ({}/{})", accepted, total);
                         auto ev = std::make_unique<Event>(Event{ .kind = Event::Kind::EnrollStatus });
                         ev->status = "enroll-stage-passed";
                         PostEvent(std::move(ev));
                     },
                     [&] {
+                        std::println("  enrol: sample REFUSED (retry-scan)");
                         auto ev = std::make_unique<Event>(Event{ .kind = Event::Kind::EnrollStatus });
                         ev->status = "enroll-retry-scan";
                         PostEvent(std::move(ev));