diff --git a/bootstrap.php b/bootstrap.php
index f292bb4..237f3cc 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -15,6 +15,7 @@ function ml_get_lisp(): array
     $env = new MadLisp\Env();
 
     (new MadLisp\Lib\Math())->register($env);
+    (new MadLisp\Lib\Compare())->register($env);
 
     /*
     $env->set('eval', function (...$args) use ($eval, $env) {
diff --git a/src/Lib/Compare.php b/src/Lib/Compare.php
new file mode 100644
index 0000000..0fbeeef
--- /dev/null
+++ b/src/Lib/Compare.php
@@ -0,0 +1,45 @@
+<?php
+namespace MadLisp\Lib;
+
+use MadLisp\CoreFunc;
+use MadLisp\Env;
+
+class Compare implements ILib
+{
+    public function register(Env $env): void
+    {
+        // TODO: handle collections
+
+        $env->set('=', new CoreFunc('=', 'Return true if arguments are equal.', 2, 2,
+            fn ($a, $b) => $a == $b
+        ));
+
+        $env->set('==', new CoreFunc('==', 'Return true if arguments are equal using strict comparison.', 2, 2,
+            fn ($a, $b) => $a === $b
+        ));
+
+        $env->set('!=', new CoreFunc('!=', 'Return true if arguments are not equal.', 2, 2,
+            fn ($a, $b) => $a != $b
+        ));
+
+        $env->set('!==', new CoreFunc('!==', 'Return true if arguments are not equal using strict comparison.', 2, 2,
+            fn ($a, $b) => $a !== $b
+        ));
+
+        $env->set('<', new CoreFunc('<', 'Return true if first argument is less than second argument.', 2, 2,
+            fn ($a, $b) => $a < $b
+        ));
+
+        $env->set('<=', new CoreFunc('<=', 'Return true if first argument is less or equal to second argument.', 2, 2,
+            fn ($a, $b) => $a <= $b
+        ));
+
+        $env->set('>', new CoreFunc('>', 'Return true if first argument is greater than second argument.', 2, 2,
+            fn ($a, $b) => $a > $b
+        ));
+
+        $env->set('>=', new CoreFunc('>=', 'Return true if first argument is greater or equal to second argument.', 2, 2,
+            fn ($a, $b) => $a >= $b
+        ));
+    }
+}
diff --git a/src/Lib/Core.php b/src/Lib/Core.php
index 83eb5a3..906773b 100644
--- a/src/Lib/Core.php
+++ b/src/Lib/Core.php
@@ -13,17 +13,6 @@ class Core implements ILib
 {
     public function register(Env $env): void
     {
-        // arithmetic
-
-        // comparison
-
-        $env->set('=', fn ($a, $b) => $a == $b);
-        $env->set('<', fn ($a, $b) => $a < $b);
-        $env->set('>', fn ($a, $b) => $a > $b);
-        $env->set('<=', fn ($a, $b) => $a <= $b);
-        $env->set('>=', fn ($a, $b) => $a >= $b);
-        $env->set('!=', fn ($a, $b) => $a != $b);
-
         // types
 
         $env->set('type?', function ($a) {