diff --git a/contrib/oid2name/README.oid2name b/contrib/oid2name/README.oid2name
index 51eb5277f5..53d88e23b4 100644
--- a/contrib/oid2name/README.oid2name
+++ b/contrib/oid2name/README.oid2name
@@ -101,6 +101,10 @@ $ du * | while read SIZE OID
 1950    23903  = customers
 ...
 
+This can be done in psql with:  (each page is typically 8k)
+
+test=> SELECT relpages, relname FROM pg_class ORDER BY relpages DESC;
+
 
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