Point out the dependency on having int8 arithmetic available.

diff --git a/doc/src/sgml/ref/create_sequence.sgml b/doc/src/sgml/ref/create_sequence.sgml
index 334d45dd8b9068ed3bdeb5763a79e5c22699f37b..f2e343660d881c9299bad55c7a3fe40ea9d2c4d2 100644 (file)
--- a/doc/src/sgml/ref/create_sequence.sgml
+++ b/doc/src/sgml/ref/create_sequence.sgml
@@ -1,5 +1,5 @@
 
 
@@ -287,9 +287,20 @@ SELECT * FROM seqname;
    </div>
<div class="diff ctx">     Notes</div>
<div class="diff ctx">    
+
    
     Use DROP SEQUENCE to remove a sequence.
    
+
+   
+    Sequences are based on bigint arithmetic, so the range cannot
+    exceed the range of an eight-byte integer
+    (-9223372036854775808 to 9223372036854775807).  On some older platforms,
+    there may be no compiler support for eight-byte integers, in which case
+    sequences use regular integer arithmetic (range
+    -2147483648 to +2147483647).
+   
+
    
     When cache is greater than
     one, each backend uses its own cache to store preallocated numbers.