pg_upgrade: document delete problems with tablespaces inside the cluster directory

Per report by Marc Mamin

diff --git a/doc/src/sgml/pgupgrade.sgml b/doc/src/sgml/pgupgrade.sgml
index 4d03b12f11945ce303e6b4911f7a7be00bd1051d..72e3cb68c286b4ec85b91e0a6d5673de319ff544 100644 (file)
--- a/doc/src/sgml/pgupgrade.sgml
+++ b/doc/src/sgml/pgupgrade.sgml
@@ -460,7 +460,8 @@ psql --username postgres --file script.sql postgres
      cluster's data directories by running the script mentioned when
      pg_upgrade completes. You can also delete the
      old installation directories
-     (e.g. bin, share).
+     (e.g. bin, share).  This will not work
+     if you have tablespaces inside the old data directory.