Mention the actual stored size of NUMERIC values, per David Fetter.

diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 5ca2ab2f61bbad47d225dd92b016f8a27704daf5..06183ec9e76802696bbc98bc156ad19ddc01799a 100644 (file)
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -1,5 +1,5 @@
 
 
  
@@ -505,7 +505,9 @@ NUMERIC
      trailing zeroes.  Thus, the declared precision and scale of a column
      are maximums, not fixed allocations.  (In this sense the numeric
      type is more akin to varchar(n)
-     than to char(n).)
+     than to char(n).)  The actual storage
+     requirement is two bytes for each group of four decimal digits,
+     plus eight bytes overhead.