diff --git a/src/rect.rs b/src/rect.rs
index bc4ca43..ae91191 100644
--- a/src/rect.rs
+++ b/src/rect.rs
@@ -160,6 +160,7 @@ impl Rect {
     }
 
     /// Whether this rectangle has zero area.
+    #[doc(alias = "is_empty")]
     #[inline]
     pub fn is_zero_area(&self) -> bool {
         self.area() == 0.0
diff --git a/src/size.rs b/src/size.rs
index 4eb97f6..3fe4b3a 100644
--- a/src/size.rs
+++ b/src/size.rs
@@ -66,6 +66,7 @@ impl Size {
     }
 
     /// Whether this size has zero area.
+    #[doc(alias = "is_empty")]
     #[inline]
     pub fn is_zero_area(self) -> bool {
         self.area() == 0.0