Fixes #1164

Added a comment about `inThrottle`.

snippets/throttle.md

@@ -8,6 +8,7 @@ Creates a throttled function that only invokes the provided function at most onc
 Use `setTimeout()` and `clearTimeout()` to throttle the given method, `fn`.
 Use `Function.prototype.apply()` to apply the `this` context to the function and provide the necessary `arguments`.
 Use `Date.now()` to keep track of the last time the throttled function was invoked.
+Use a variable, `inThrottle`, to prevent a race condition between the first execution of `fn` and the next loop.
 Omit the second argument, `wait`, to set the timeout at a default of 0 ms.
 
 ```js
@@ -41,4 +42,4 @@ window.addEventListener(
     console.log(window.innerHeight);
   }, 250)
 ); // Will log the window dimensions at most every 250ms
-```
+```