doc: clarification under nullify method.

* txr.1: the nullify method need not return the object
itself in the non-empty case; it may also return
a sequence.

1 files changed, 2 insertions, 1 deletions

diff --git a/txr.1 b/txr.1
index 8569f797..051eafff 100644
--- a/txr.1
+++ b/txr.1
@@ -22173,7 +22173,8 @@ The
 method should return
 .code nil
 if the object is considered to denote an empty sequence. Otherwise it
-should return that object itself.
+should either return that object itself, or else return the sequence which
+that object represents.
 
 .coNP Function @ from-list
 .synb