diff --git a/README.md b/README.md
index 0a8fdd7..b5e0934 100644
--- a/README.md
+++ b/README.md
@@ -444,8 +444,9 @@ floor | `(floor 2.5)` | `2` | Get the next lowest integer.
 ceil  | `(ceil 2.5)` | `3` | Get the next highest integer.
 pow   | `(pow 2 4)` | `16` | Raise the first argument to the power of the second argument.
 sqrt  | `(sqrt 2)` | `1.41` | Calculate the square root.
-coinflip | `(coinflip)` | `true` | Return true or false with equal probability.
 rand  | `(rand 5 10)` | `8` | Return a random integer between given min and max values.
+randf | `(randf)` | `0.678` | Return a random float between 0 (inclusive) and 1 (exclusive).
+rand-seed | `(rand-seed 256)` | `256` | Seed the random number generator with the given value.
 
 ### Regular expression functions
 
diff --git a/src/Lib/Math.php b/src/Lib/Math.php
index 06aa9bf..a3c4643 100644
--- a/src/Lib/Math.php
+++ b/src/Lib/Math.php
@@ -122,12 +122,19 @@ class Math implements ILib
 
         // Random number generator
 
-        $env->set('coinflip', new CoreFunc('coinflip', 'Return true or false with equal probability.', 0, 0,
-            fn () => boolval(mt_rand(0, 1))
-        ));
-
         $env->set('rand', new CoreFunc('rand', 'Return a random integer between given min and max values.', 2, 2,
             fn ($min, $max) => mt_rand($min, $max)
         ));
+
+        $env->set('randf', new CoreFunc('randf', 'Return a random float between given 0 (inclusive) and 1 (exclusive).', 0, 0,
+            fn () => mt_rand(0, mt_getrandmax() - 1) / mt_getrandmax()
+        ));
+
+        $env->set('rand-seed', new CoreFunc('rand-seed', 'Seed the random number generator with the given value.', 1, 1,
+            function (int $a) {
+                mt_srand($a);
+                return $a;
+            }
+        ));
     }
 }