diff --git a/broker/JFJochStateMachine.cpp b/broker/JFJochStateMachine.cpp
index 85aba5d99..e8b3f7ce9 100644
--- a/broker/JFJochStateMachine.cpp
+++ b/broker/JFJochStateMachine.cpp
@@ -399,18 +399,6 @@ void JFJochStateMachine::Start(const DatasetSettings &settings, bool async) {
 
     experiment.ImportDatasetSettings(settings);
 
-    // A sweep arriving under an MX mode. The mode says stills - it is the only MX mode this API can
-    // express - but the goniometer says the crystal turns, and analysing a sweep frame by frame is a
-    // different measurement from the one the data support. It is said out loud rather than refused:
-    // collecting rotation data here is normal and per-image spot counts are useful live feedback, so
-    // the mistake worth preventing is not the acquisition but the silence about what was done to it.
-    if (experiment.GetAnalysisSettings().IsMX()
-        && experiment.GetGoniometer().has_value() && experiment.GetGoniometer()->IsScanning())
-        logger.Warning("Analysis mode is {} but the goniometer scans: this sweep is analysed frame by "
-                       "frame as stills. jfjoch_broker has no rotation analysis - process the stored "
-                       "file with rugnux for that.",
-                       AnalysisModeName(experiment.GetAnalysisMode()));
-
     cancel_sequence = false;
     if (experiment.GetStorageCellNumber() == 1)
         experiment.StorageCellStart(15);
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 0246d8e42..e561147f1 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -5,7 +5,7 @@
 
 * jfjoch_broker takes an explicit analysis mode (`/config/analysis`, the `analysis` block of the configuration file, and the Analysis panel of the web frontend): `MXStills` (the default), `Azint`, `Grid`, `PowderCalibration` or `None`. The mode decides what runs and takes precedence over `dataset_settings.spot_finding` and `spot_finding_settings.enable`, which are now deprecated.
 * `PowderCalibration` moves azimuthal integration onto the CPU and sets a sector count of its own, since the FPGA integration core cannot hold enough bins for a sectored profile; a calibration exposure then runs at a few Hz.
-* Rotation MX analysis is not offered online - it is absent from the REST API and refused by the broker - and a rotation sweep collected under an MX mode is logged as being analysed frame by frame as stills.
+* Rotation MX analysis is not offered online: it is absent from the REST API and refused by the broker. Rotation data is collected with jfjoch_broker and processed with rugnux.
 * `rugnux --mode` accepts `mx_rotation` and `mx_stills` beside `mx`, which continues to choose between them from the goniometer.
 * The stream and the written file record which analysis produced them, as `analysis_mode` in the CBOR start message and `/entry/MX/analysis_mode` in the HDF5 master.
 * The crystals a grid scan found travel through the CBOR end message (`grid_crystals`), the HDF5 master (`/entry/MX/crystals`) and `GET /result/scan`, which also carries a powder-calibration result.