Clarify documention workding for xip_list().

Simon Riggs

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 7d8608d01e595c636b4dd01ba1cbd5200557c62f..c03863af99aa0d6b5ffae36645e44f15ebd7715e 100644 (file)
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,4 +1,4 @@
-
+
 
  
   Functions and Operators
@@ -12006,11 +12006,14 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
       
        xip_list
        
-        Active txids at the time of the snapshot.  All of them are between
-        xmin and xmax.  A txid that is
-        xmin <= txid < xmax and not in this list was
-        already completed at the time of the snapshot, and thus either visible
-        or dead according to its commit status.
+        Active txids at the time of the snapshot.  The list
+        includes only those active txids between xmin
+        and xmax; there might be active txids higher
+        than xmax.  A txid that is xmin <= txid <
+        xmax and not in this list was already completed
+        at the time of the snapshot, and thus either visible or
+        dead according to its commit status.  The list does not
+        include txids of subtransactions.