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-rw-r--r--doc/indexamajig.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/indexamajig.txt b/doc/indexamajig.txt
index efd065bd..61fd0bd8 100644
--- a/doc/indexamajig.txt
+++ b/doc/indexamajig.txt
@@ -140,6 +140,11 @@ unmatched raw cell might be left-handed: CrystFEL doesn't check this for you.
Always using a right-handed cell means that the Bijvoet pairs can be told
apart.
+If the unit cell is centered (i.e. if the space group begins with I, R, C, A or
+F), you should be careful when using "compare" for the cell reduction, since
+(for example) DirAx will always find a primitive unit cell, and this cell must
+be converted to the non-primitive conventional cell from the PDB.
+
A Note about Unit Cell Settings
-------------------------------