diff --git a/README.md b/README.md
index 1956bfb..d83d5f7 100644
--- a/README.md
+++ b/README.md
@@ -377,6 +377,8 @@ This crate offers a set of builtin functions.
 | `bitor`              | 2               | Int                    | Computes the bitwise or of the given integers |
 | `bitxor`             | 2               | Int                    | Computes the bitwise xor of the given integers |
 | `bitnot`             | 1               | Int                    | Computes the bitwise not of the given integer |
+| `shl`                | 2               | Int                    | Computes the given integer bitwise shifted left by the other given integer |
+| `shr`                | 2               | Int                    | Computes the given integer bitwise shifted right by the other given integer |
 
 The `min` and `max` functions can deal with a mixture of integer and floating point arguments.
 If the maximum or minimum is an integer, then an integer is returned.