Small tweak

src/Symmetry/Crystal.jl

@@ -45,7 +45,8 @@ as a number 1..230 or as a string, e.g., Hermann–Mauguin or Hall symbol. If on
 a spacegroup number is provided, the ITA standard setting will be employed [1],
 consistent with conventions from the Bilbao crystallographic server [2]. If a
 spacegroup symbol is provided that allows for multiple ITA settings, the
-possible disambiguations will be included in an error message.
+possible disambiguations will be included in an error message, and may involve a
+`choice` string.
 
 
 # Examples