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diff --git a/doc/uninorm.texi b/doc/uninorm.texi
index 6797fe85..5cad859b 100644
--- a/doc/uninorm.texi
+++ b/doc/uninorm.texi
@@ -133,6 +133,11 @@ Returns the canonical character decomposition mapping of the Unicode character
When a decomposition exists, @code{@var{decomposition}[0..@var{n}-1]} is filled
and @var{n} is returned. Otherwise -1 is returned.
+
+Note: This function returns the (simple) ``canonical decomposition'' of
+@var{uc}. If you want the ``full canonical decomposition'' of @var{uc},
+that is, the recursive application of ``canonical decomposition'', use the
+function @code{u*_normalize} with argument @code{UNINORM_NFD} instead.
@end deftypefun
@node Composition of characters