diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index b65aa28f344..9d71678029e 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1347,6 +1347,23 @@ repeat('Pg', 4) PgPgPgPg
+
+
+
+ factorial
+
+ factorial ( bigint )
+ numeric
+
+
+ Factorial
+
+
+ factorial(5)
+ 120
+
+
+