Add index entries for function volatilities.

diff --git a/doc/src/sgml/xfunc.sgml b/doc/src/sgml/xfunc.sgml
index 06eef22db5a894597faa83a8e85a685a9bd7bfbc..51566d1056f24f75321d729d6395b55420c67a4a 100644 (file)
--- a/doc/src/sgml/xfunc.sgml
+++ b/doc/src/sgml/xfunc.sgml
@@ -1,5 +1,5 @@
 
 
  
@@ -772,6 +772,15 @@ CREATE FUNCTION test(int, int) RETURNS int
     volatility
     functions
    
+   
+    VOLATILE
+   
+   
+    STABLE
+   
+   
+    IMMUTABLE
+   
 
    
     Every function has a volatility classification, with