diff --git a/help/arithmetic_functions.html b/help/arithmetic_functions.html
index 8b3558f..0f8e0c7 100644
--- a/help/arithmetic_functions.html
+++ b/help/arithmetic_functions.html
@@ -49,6 +49,8 @@
+
+
@@ -193,6 +195,13 @@ the function returns the max value which can be held in this precision.
This functions takes any number of arguments. It returns the min value of them. If there aren't arguments
the function returns the min value which can be held in this precision.
+sum(x1; x2; ...)
+This functions takes one or more arguments. It returns the sum of them.
+
+avg(x1; x2; ...)
+This functions takes one or more arguments. It returns the arithmetic mean. (The sum divided by
+the number of arguments)
+