diff --git a/src/SizesContext.js b/src/SizesContext.js
index d397ebe..04a773d 100644
--- a/src/SizesContext.js
+++ b/src/SizesContext.js
@@ -1,6 +1,8 @@
 import React from 'react'
 
 const SizesContext = React.createContext({
+  // Keep these fields in sync with the excluded fields in the `render()`
+  // function of `withSizes.js`
   fallbackWidth: null,
   fallbackHeight: null,
   forceFallback: false,
diff --git a/src/withSizes.js b/src/withSizes.js
index ef7fb16..d99b58f 100644
--- a/src/withSizes.js
+++ b/src/withSizes.js
@@ -75,9 +75,12 @@ const withSizes = (...mappedSizesToProps) => WrappedComponent => {
 
     render() {
       const {
+        // Ensure all the `SizesContext.js` arguments are excluded.
+        // Keep this in sync with `SizesContextjs` fields
         fallbackHeight,
         fallbackWidth,
         forceFallback,
+        throttle,
         ...otherProps
       } = this.props