diff --git a/src/Twig/Functions/IconExtension.php b/src/Twig/Functions/IconExtension.php
index cca3498..154a819 100644
--- a/src/Twig/Functions/IconExtension.php
+++ b/src/Twig/Functions/IconExtension.php
@@ -12,11 +12,12 @@ final class IconExtension extends AbstractExtension
     public const DEFAULT_SIZE = 32;
 
     private const DEFAULT_OPTIONS = [
-        'icon' => null,
-        'title' => null,
-        'size' => self::DEFAULT_SIZE,
-        'colour' => 'primary',
-        'hover' => null
+        'icon'    => null,
+        'title'   => null,
+        'size'    => self::DEFAULT_SIZE,
+        'colour'  => 'primary',
+        'hover'   => null,
+        'classes' => [],
     ];
 
     public function __construct(private array $directories, private array $palletes)
@@ -33,10 +34,10 @@ final class IconExtension extends AbstractExtension
         if (empty($this->palletes))
             throw new \InvalidArgumentException('Palletes array must contain at least one pallet!');
 
-        $pelletesContainNonarray = array_reduce($this->palletes,
+        $palletesContainNonarray = array_reduce($this->palletes,
             fn($notArray, $path) => $notArray || !is_array($path));
 
-        if ($pelletesContainNonarray)
+        if ($palletesContainNonarray)
             throw new \TypeError('Palletes array must only contain arrays!');
 
         foreach ($this->palletes as $pallete) {
@@ -69,11 +70,14 @@ final class IconExtension extends AbstractExtension
      * @param array $options
      * ```
      * $options = [
-     *     'icon'   => (string)  Which icon to use
-     *     'title'  => (?string) Text to appear on mouse hover
-     *     'size'   => (int)     Height and width in px
-     *     'colour' => (string)  Main colour pallete
-     *     'hover'  => (?string) Hover colour pallete
+     *     'icon'     => (string)  REQUIRED Which icon to use
+     *     'title'    => (?string) Text to appear on mouse hover
+     *     'size'     => (int)     Height and width in px
+     *     'colour'   => (string)  Main colour pallete
+     *     'hover'    => (?string) Hover colour pallete
+     *     'classes'  => (array)   Additional classes to add to the icon.
+     *                             Use with caution as this can potentially
+     *                             cause Tailwind class conflicts!
      * ]
      * ```
      */
@@ -81,14 +85,22 @@ final class IconExtension extends AbstractExtension
     {
         $options = $this->getMergedOptions($userOptions);
         $svg = $this->getSanitisedIconSvg($options['icon']);
+
         $colourClasses = $this->getColourClasses($options['colour'], $options['hover']);
-        $svg = $this->addClassesToSvg($svg, $colourClasses);
+        $extraClasses = $this->getExtraClasses($options['classes']);
+
+        $svg = $this->addClassesToSvg($svg, trim($colourClasses.' '.$extraClasses));
         $svg = $this->addTitleToSvgIfNotNull($svg, $options['title']);
         $svg = $this->setSvgHeightAndWidth($svg, $options['size']);
 
         return $svg;
     }
 
+    private function getExtraClasses(array $extraClasses): string
+    {
+        return implode(' ', $extraClasses);
+    }
+
     private function getMergedOptions(array $userOptions): array
     {
         $this->throwIfUnrecognisedOptionExists($userOptions);
diff --git a/tests/Twig/Functions/IconExtensionTest.php b/tests/Twig/Functions/IconExtensionTest.php
index 37d785a..9e571d6 100644
--- a/tests/Twig/Functions/IconExtensionTest.php
+++ b/tests/Twig/Functions/IconExtensionTest.php
@@ -300,6 +300,26 @@ class IconExtensionTest extends TestCase
         $this->assertMatchesRegularExpression('/<svg.+class=".*group-hover:stroke-white.*".*>/', $contents);
     }
 
+    public function testExtraClassesThrowsIfNotAnArray(): void
+    {
+        $this->expectException(\TypeError::class);
+        $this->icon->renderIcon(['icon' => self::ICON, 'classes' => 'string_value']);
+    }
+
+    public function testExtraClassesGetAdded(): void
+    {
+        $contents = $this->icon->renderIcon(['icon' => self::ICON, 'classes' => ['abc', 'def']]);
+        $this->assertMatchesRegularExpression('/<svg.+class=".*abc.*".*>/', $contents);
+        $this->assertMatchesRegularExpression('/<svg.+class=".*def.*".*>/', $contents);
+    }
+
+    public function testAddingExtraClassesDoesntStripAwayColourClasses(): void
+    {
+        $contents = $this->icon->renderIcon(['icon' => self::ICON, 'classes' => ['abc']]);
+        $this->assertMatchesRegularExpression('/<svg.+class=".*abc.*".*>/', $contents);
+        $this->assertMatchesRegularExpression('/<svg.+class=".*fill-primary.*".*>/', $contents);
+    }
+
     public function testThrowsIfInvalidOptionPassed(): void
     {
         $this->expectException(\InvalidArgumentException::class);