Clean up description of SET CONSTRAINTS.

diff --git a/doc/src/sgml/ref/set.sgml b/doc/src/sgml/ref/set.sgml
index 172151eddd32af0050d33b11939bacb3291bc03e..84dfa32035a0ea9ee704db474cc18338d2da291e 100644 (file)
--- a/doc/src/sgml/ref/set.sgml
+++ b/doc/src/sgml/ref/set.sgml
@@ -1,5 +1,5 @@
 
 
@@ -266,12 +266,14 @@ SELECT setseed(value);
      
 
      
-      CONSTRAINT
+      CONSTRAINTS
       
        
-   SET CONSTRAINTS controls the frequency of foreign key
-   constratint checking in the current transaction. Allowed
-   parameters are:
+   SET CONSTRAINTS affects the behavior of constraint evaluation
+   in the current transaction.
+   SET CONSTRAINTS, specified
+   in SQL3, has these allowed parameters:
+
    
     
      constraintlist
@@ -295,12 +297,19 @@ SELECT setseed(value);
        
 
        
-   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.
        
+
+       
+   In DEFERRED mode, foreign key constraints
+   marked as DEFERRABLE are checked only at
+   transaction commit or  until its mode is explicitly set to 
+   IMMEDIATE.
+   This is actually only done for foreign  key
+   constraints,  so  it  does  not  apply  to  UNIQUE  or  other
+   constraints.
+