diff --git a/core/src/color.rs b/core/src/color.rs
index ad60592a..954aad66 100644
--- a/core/src/color.rs
+++ b/core/src/color.rs
@@ -197,7 +197,7 @@ impl Color {
     }
 
     /// Returns the relative luminance of the [`Color`].
-    /// https://www.w3.org/TR/WCAG21/#dfn-relative-luminance
+    /// <https://www.w3.org/TR/WCAG21/#dfn-relative-luminance>
     pub fn relative_luminance(self) -> f32 {
         let linear = self.into_linear();
         0.2126 * linear[0] + 0.7152 * linear[1] + 0.0722 * linear[2]