diff --git a/docs/RUGNUX.md b/docs/RUGNUX.md
index 3126b11c..9ed73bc9 100644
--- a/docs/RUGNUX.md
+++ b/docs/RUGNUX.md
@@ -295,17 +295,13 @@ XDS convention: ROTATION_AXIS= -1.000000 0.000000 0.000000
 ```
 
 XDS is never given this geometry — the [XDS plugin](SOFTWARE_INTEGRATION.md) supplies image data
-only, and XDS refines its own from `XDS.INP` — which is exactly what makes the comparison worth
-having. The two laboratory frames coincide (x along increasing detector column, y along increasing
-row, z along the beam), so the numbers are directly comparable. Two things to keep in mind:
-
-- **`ORGX`/`ORGY` are 1-based**, because XDS counts pixels from 1 while Jungfraujoch counts from 0.
-- They are the **PONI**, the foot of the perpendicular from the crystal, not the direct beam — the
-  same quantity Jungfraujoch's beam centre is, so no correction is needed, but not the same as the
-  direct beam once the detector is tilted (see above).
-
-A tilt is reported as the two detector axis vectors rather than as angles, which is how XDS reports
-it after refinement.
+only, and XDS refines its own from `XDS.INP` — which is what makes the comparison worth having. The
+two laboratory frames coincide (x along increasing detector column, y along increasing row, z along
+the beam), so the numbers are directly comparable, and a tilt appears as the two detector axis
+vectors rather than as angles, which is how XDS reports it after refinement. Two things to keep in
+mind: **`ORGX`/`ORGY` are 1-based**, because XDS counts pixels from 1 and Jungfraujoch from 0; and
+they are the **PONI**, the same quantity Jungfraujoch's beam centre is — so no correction is needed —
+but not the direct beam once the detector is tilted (see above).
 
 ## Quick start