1 files changed, 20 insertions, 7 deletions
diff --git a/Doc/Zsh/expn.yo b/Doc/Zsh/expn.yo
index c9c67bebb..c18a297ad 100644
--- a/Doc/Zsh/expn.yo
+++ b/Doc/Zsh/expn.yo
@@ -723,9 +723,10 @@ example by using `tt(${(AA)=)var(name)tt(=)...tt(})' to activate
 field splitting, when creating an associative array.
 )
 item(tt(a))(
-With tt(o) or tt(O), sort in array index order. Note that `tt(oa)' is
-therefore equivalent to the default but `tt(Oa)' is useful for
-obtaining an array's elements in reverse order.
+Sort in array index order; when combined with `tt(O)' sort in reverse
+array index order.  Note that `tt(a)' is therefore equivalent to the
+default but `tt(Oa)' is useful for obtaining an array's elements in reverse
+order.
 )
 item(tt(c))(
 With tt(${#)var(name)tt(}), count the total number of characters in an array,
@@ -750,7 +751,7 @@ Join the words of arrays together using newline as a separator.
 This is a shorthand for `tt(pj:\n:)'.
 )
 item(tt(i))(
-With tt(o) or tt(O), sort case-independently.
+Sort case-insensitively.  May be combined with `tt(n)' or `tt(O)'.
 )
 item(tt(k))(
 If var(name) refers to an associative array, substitute the em(keys)
@@ -763,13 +764,25 @@ item(tt(L))(
 Convert all letters in the result to lower case.
 )
 item(tt(n))(
-With tt(o) or tt(O), sort numerically.
+Sort decimal numbers numerically; if the first differing
+characters of two test strings are not digits, sorting
+is lexical.   Numbers with initial zeroes
+are sorted before those without.  Hence the array `tt(foo1 foo02
+foo2 foo3 foo20 foo23)' is sorted into the order shown.  Trailing
+non-digits are not sorted; the order of `tt(2foo)' and `tt(2bar)'
+is not defined.  May be combined with `tt(i)' or `tt(O)'.
 )
 item(tt(o))(
-Sort the resulting words in ascending order.
+Sort the resulting words in ascending order; if this appears on its
+own the sorting is lexical and case-sensitive (unless the locale
+renders it case-insensitive).  Sorting in ascending order is the
+default for other forms of sorting, so this is ignored if combined
+with `tt(a)', `tt(i)' or `tt(n)'.
 )
 item(tt(O))(
-Sort the resulting words in descending order.
+Sort the resulting words in descending order; `tt(O)' without `tt(a)',
+`tt(i)' or `tt(n)' sorts in reverse lexical order.  May be combined
+with `tt(a)', `tt(i)' or `tt(n)' to reverse the order of sorting.
 )
 item(tt(P))(
 This forces the value of the parameter var(name) to be interpreted as a