diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 67d0c34..01a8492 100644
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -1654,10 +1654,11 @@ SELECT E'\\xDEADBEEF';
     the full range of values. When <type>timestamp</> values are
     stored as double precision floating-point numbers instead (a
     deprecated compile-time option), the effective limit of precision
-    might be less than 6. <type>timestamp</type> values are stored as
-    seconds before or after midnight 2000-01-01.  When
+    might be less than 6. By default <type>timestamp</type> values are
+    storead as microseconds before or after midnight 2000-01-01.  When
     <type>timestamp</type> values are implemented using floating-point
-    numbers, microsecond precision is achieved for dates within a few
+    numbers, values are storead as number of seconds. In this case
+    microsecond precision is achieved for dates within a few
     years of 2000-01-01, but the precision degrades for dates further
     away. Note that using floating-point datetimes allows a larger
     range of <type>timestamp</type> values to be represented than