diff --git a/image_analysis/WriteReflections.cpp b/image_analysis/WriteReflections.cpp
index e385f426..80017e97 100644
--- a/image_analysis/WriteReflections.cpp
+++ b/image_analysis/WriteReflections.cpp
@@ -118,6 +118,12 @@ void WriteMmcifReflections(const std::vector<MergedReflection> &reflections,
 
     out << "_diffrn_radiation_wavelength.wavelength  " << Fmt(experiment.GetWavelength_A(), 5) << "\n";
     out << "_diffrn_detector.detector  " << CifStr(experiment.GetDetectorDescription()) << "\n";
+    // Detector geometry actually used for integration (refined, when geometry refinement ran - the rotation
+    // two-pass or the stills global refinement update it on experiment_ before the written pass). jfjoch_
+    // local-data-name items: feedback of the distance / beam centre the data was reduced with.
+    out << "_diffrn_detector.jfjoch_distance_mm       " << Fmt(experiment.GetDetectorDistance_mm(), 4) << "\n";
+    out << "_diffrn_detector.jfjoch_beam_center_x_pxl " << Fmt(experiment.GetBeamX_pxl(), 2) << "\n";
+    out << "_diffrn_detector.jfjoch_beam_center_y_pxl " << Fmt(experiment.GetBeamY_pxl(), 2) << "\n";
     out << "#\n";
 
     // ---------- merging statistics (_reflns overall + _reflns_shell loop) ----------