1 files changed, 9 insertions, 0 deletions
diff --git a/src/font.rs b/src/font.rs
index 516d4bbe..a55a2a13 100644
--- a/src/font.rs
+++ b/src/font.rs
@@ -2,6 +2,7 @@
 
 use std::collections::HashMap;
 use std::fmt::{self, Debug, Display, Formatter};
+use std::ops::Add;
 
 use serde::{Deserialize, Serialize};
 
@@ -156,6 +157,14 @@ impl Em {
     }
 }
 
+impl Add for Em {
+    type Output = Self;
+
+    fn add(self, other: Self) -> Self {
+        Self(self.0 + other.0)
+    }
+}
+
 /// Caches parsed font faces.
 pub struct FontCache {
     faces: Vec<Option<Face>>,