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diff --git a/doc/symmetry.txt b/doc/symmetry.txt
index d29ea137..c190f8ee 100644
--- a/doc/symmetry.txt
+++ b/doc/symmetry.txt
@@ -6,7 +6,8 @@ Most programs in CrystFEL understand point group symmetry. The exception is
the "-y" option to the programs.
Please read doc/process_hkl for important information on how symmetry is used
-during the indexing and merging procedures.
+during the indexing and merging procedures. It's important to understand how
+this works before, for example, trying to merge a dataset.
Symmetry definitions are included in src/symmetry.c. Point group definitions
are required for merging and the display of merged results, but space groups are