diff --git a/README.md b/README.md
index ecf02e9..d5493fd 100644
--- a/README.md
+++ b/README.md
@@ -459,7 +459,43 @@ if (int_opt?) {
 
 ## Built-in functions
 
-- [`print(text: string)`](#print-text-string)
+- [`print(text: string)`](#printtext-string)
+- [`floor(number: T) -> T`](#floornumber-t-t)
+- [`ceil(number: T) -> T`](#floornumber-t-t)
+- [`round(number: T) -> T`](#roundnumber-t-t)
+- [`sqrt(number: T) -> T`](#sqrtnumber-t-t)
+- [`pow(number: T, exponent: N) -> T`](#pownumber-t-exponent-n)
+- [`random() -> f32`](#random-f32)
+- [`time_now() -> i32`](#time-now-i32)
+- [`random64() -> f64`](#random64-f64)
+- [`time_now64() -> i64`](#time-now64-i64)
 
 #### `print(text: string)`
 Prints `text` to standard (stdout, to console by default). This is configurable by changing stdout in the Omega VM.
+
+#### `floor(number: T) -> T`
+Floors `number` (rounding downwards), where T is either `f32` or `f64`, and then returns the value of the floor of that same type.
+
+#### `ceil(number: T) -> T`
+Ceils `number` (rounding upwards), where T is either `f32` or `f64`, and then returns the value of the ceil of that same type.
+
+#### `round(number: T) -> T`
+Rounds `number`, where T is either `f32` or `f64`, and then returns the value of the round of that same type.
+
+#### `sqrt(number: T) -> T`
+Returns the square root of `number`, where T is either `f32` or `f64`.
+
+#### `pow(number: T, exponent: N) -> T`
+Returns the power of `number` to the exponent of `exponent`, where T and N is either `i16`, `i32`, `i64`, `f32` or `f64`.
+
+#### `random() -> f32`
+Returns a random number between 0 and 1.
+
+#### `time_now() -> i32`
+Returns the current time in milliseconds since January 1st 1970.
+
+#### `random64() -> f64`
+Functions like [`random() -> f32`](#random-f32), except it returns a more accurate f64.
+
+#### `time_now64() -> i64`
+Returns the current time in nanoseconds since January 1st 1970.