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-rw-r--r--doc/man/crystfel_geometry.5.md3
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diff --git a/doc/man/crystfel_geometry.5.md b/doc/man/crystfel_geometry.5.md
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--- a/doc/man/crystfel_geometry.5.md
+++ b/doc/man/crystfel_geometry.5.md
@@ -534,6 +534,9 @@ above.
The highest-level group should always be called **all**.
+The group definitions must come **after** the panel definitions. A good way
+to go is to put all the group definitions at the very end of the geometry file.
+
If the detector consists of only one panel, CrystFEL will automatically create
the **all** group containing it.