Document the sign() function.

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 0dc19768c1cdb62f6e1cec44a2887b19aa866260..0a8b2f6d73478b0634b33343559cc8cdceaaec8a 100644 (file)
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,4 +1,4 @@
-
+
 
 
  Functions and Operators
@@ -640,6 +640,14 @@
       
      
 -->
+     
+      sign(numeric)
+      numeric
+      sign of the argument (-1, 0, +1)
+      sign(-8.4)
+      -1
+     
+
      
       sqrt(dp)
       dp