Update set constraints man page

diff --git a/doc/src/sgml/ref/set.sgml b/doc/src/sgml/ref/set.sgml
index 0628ed673a6cdf0dfaebae3f45b5b24ffab8dc29..172151eddd32af0050d33b11939bacb3291bc03e 100644 (file)
--- a/doc/src/sgml/ref/set.sgml
+++ b/doc/src/sgml/ref/set.sgml
@@ -1,5 +1,5 @@
 
 
@@ -269,10 +269,9 @@ SELECT setseed(value);
       CONSTRAINT
       
        
-   SET CONSTRAINTS is the SQL3 specified command to  change  the
-   default behaviour of constraints with respect to deferring in the current
-   transaction. Allowed parameters are:
-
+   SET CONSTRAINTS controls the frequency of foreign key
+   constratint checking in the current transaction. Allowed
+   parameters are:
    
     
      constraintlist
@@ -296,11 +295,11 @@ SELECT setseed(value);
        
 
        
-   In deferred mode, the actual check of the constraint is  held
-   back  until  either its mode is explicitly set to IMMEDIATE,
-   or until COMMIT.  This is actually only done for foreign  key
-   constraints,  so  it  does  not  apply  to  UNIQUE  or  other
-   constraints.
+   In DEFERRED mode, foreign key constraints
+   marked as DEFERRABLE are checked only at
+   transaction commit.
+   In IMMEDIATE mode, foreign key constraints
+   are checked at the end of each query.