diff --git a/packages/splitjs/index.d.ts b/packages/splitjs/index.d.ts
index a25076682..a50b330c9 100644
--- a/packages/splitjs/index.d.ts
+++ b/packages/splitjs/index.d.ts
@@ -26,6 +26,9 @@ declare namespace Split {
         // Minimum size of each element.
         minSize?: number | number[]
 
+        // Maximum size of each element.
+        maxSize?: number | number[]
+
         expandToMin?: boolean
 
         // Gutter size in pixels.