diff --git a/README.md b/README.md
index 36f6852..caae451 100644
--- a/README.md
+++ b/README.md
@@ -29,8 +29,48 @@ series of datasets named `data_000001`, `data_000002`, etc.
 
 
 ## Building
+First ensure that the HDF5 libraries are compiled with:
+
+```
+./configure --enable-threadsafe=yes --enable-unsupported
+```
+
+former is neeed to ensure that XDS in parallel mode will work, latter
+to ensure that the chunk read (which for opaque reasons is defined to
+be _high level_) works. Then make sure that wherever this was
+installed, the h5cc is in PATH before:
+
 ```
 cd durin
 make
 ```
-Plugin file is `build/durin-plugin.so`
+
+Plugin file is `build/durin-plugin.so` - this should be added to the
+XDS.INP file i.e. as:
+
+```
+DETECTOR=PILATUS MINIMUM_VALID_PIXEL_VALUE=0 OVERLOAD=4096
+LIB=/opt/durin/build/durin-plugin.so
+SENSOR_THICKNESS= 0.450
+!SENSOR_MATERIAL / THICKNESS Si 0.450
+!SILICON= 3.953379
+DIRECTION_OF_DETECTOR_X-AXIS= 1.00000 0.00000 0.00000
+DIRECTION_OF_DETECTOR_Y-AXIS= 0.00000 1.00000 0.00000
+NX=2070 NY=2164 QX=0.0750 QY=0.0750
+DETECTOR_DISTANCE= 194.633000
+ORGX= 1041.30 ORGY= 1160.90
+ROTATION_AXIS= 0.00000 -1.00000 -0.00000
+STARTING_ANGLE= -30.000
+OSCILLATION_RANGE= 0.100
+X-RAY_WAVELENGTH= 0.97891
+INCIDENT_BEAM_DIRECTION= -0.000 -0.000 1.022
+FRACTION_OF_POLARIZATION= 0.999
+POLARIZATION_PLANE_NORMAL= 0.000 1.000 0.000
+NAME_TEMPLATE_OF_DATA_FRAMES= ../image_9264_??????.h5
+TRUSTED_REGION= 0.0 1.41
+DATA_RANGE= 1 600
+JOB=XYCORR INIT COLSPOT IDXREF DEFPIX INTEGRATE CORRECT
+```
+
+N.B. the master file is needed, not the .nxs one which follows the
+standard.