Tweak comment

src/Symmetry/SpacegroupData.jl

@@ -94,12 +94,11 @@ function standard_setting_for_hall_number(hall_number)
     Sunny.standard_setting[Sunny.all_spacegroup_types[hall_number].number]
 end
 
-# For each Hall number 1..530, define the operation P that transforms to the
-# standard setting of the associated spacegroup number. The corresponding Hall
-# numbers for these standard settings are listed in `standard_setting`. Data is
-# sourced from PyXTal,
+# For each Hall number 1..530, a string representation of the affine
+# transformation that maps lattice vectors to the ITA standard setting of the
+# associated spacegroup number. The Hall numbers of these standard settings are
+# listed in `standard_setting`. Data is sourced from PyXTal,
 # https://github.com/MaterSim/PyXtal/blob/1ba044cace1815d450e476a1fcb2fe8cb5798923/pyxtal/database/HM_Full.csv
-
 const mapping_to_standard_setting_repr = [
     "a,b,c", "a,b,c", "a,b,c", "c,a,b", "b,c,a", "a,b,c", "c,a,b", "b,c,a",
     "a,b,c", "c,-b,a", "c,b,-a-c", "c,a,b", "a,c,-b", "-a-c,c,b", "b,c,a",
@@ -189,7 +188,7 @@ function mapping_to_standard_setting(hall_number)
     # These steps were determined empirically by comparison with the Bilbao
     # server, which lists setting strings and P matrices simultaneously.
     op = parse_op(replace(mapping_to_standard_setting_repr[hall_number],
-                 "a"=>"x", "b"=>"y", "c"=>"z"))
+                          "a"=>"x", "b"=>"y", "c"=>"z"))
     P = op.R'
     p = op.T
     return SymOp(P, p)