Document alternation syntax.

* txr.1: The { x | y } notation has been used in the
document for a long time; now it is explained.

1 files changed, 8 insertions, 0 deletions

diff --git a/txr.1 b/txr.1
index 8d065c24..73396587 100644
--- a/txr.1
+++ b/txr.1
@@ -10423,6 +10423,14 @@ syntax enclosed in the braces or syntactic unit.
 This indicates a repetition of one or more of the given
 syntax enclosed in the braces or syntactic unit.
 
+.coIP {syntax | syntax | ...}
+This indicates a choice among alternatives.
+May be combined with
+.code +
+or
+.code *
+repetition.
+
 .ie n \{\
 .coIP [syntax] [<word>]
 .\}