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diff --git a/doc/unictype.texi b/doc/unictype.texi
index 0215b96..2859cc3 100644
--- a/doc/unictype.texi
+++ b/doc/unictype.texi
@@ -858,6 +858,8 @@ Returns the name of a joining group.
@deftypefun int uc_joining_group_byname (const char *@var{joining_group_name})
Returns the joining group given by name, e.g@. @code{"Teh_Marbuta"}.
+This lookup ignores spaces, underscores, or hyphens as word separators and is
+case-insignificant.
@end deftypefun
The following function gives the joining group of every Unicode character.