diff --git a/src/sizes.rs b/src/sizes.rs
index 276afa6..a7d35fb 100644
--- a/src/sizes.rs
+++ b/src/sizes.rs
@@ -567,6 +567,8 @@ impl_array_sizes_with_import! {
     510 => U510,
     511 => U511,
     512 => U512,
+    521 => U521,
+    522 => U522,
     528 => U528,
     536 => U536,
     544 => U544,