typo

Author: Froussios

Part 4 - Concurrency/4. Backpressure.md

@@ -348,7 +348,7 @@ Observable.interval(1, TimeUnit.MILLISECONDS)
 ...
 ```
 
-What we see here is that the first 128 items where consumed normally, but then we jumped forward. The items inbetween were dropped by `onBackPressureDrop`. Even though we did not request it, the first 128 items where still buffered, since `observeOn` uses a small buffer between switching threads.
+What we see here is that the first 128 items where consumed normally, but then we jumped forward. The items inbetween were dropped by `onBackPressureDrop`. Even though we did not request it, the first 128 items were still buffered, since `observeOn` uses a small buffer between switching threads.
 
 
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