Fix typo

mixu · Jan 8, 2017 · af1d806 · af1d806
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commit af1d806
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diff --git a/input/4_replication.md b/input/4_replication.md
@@ -114,7 +114,7 @@ I'll talk about all of these a bit  further on, first; let's look at the replica
 
 ## Primary/backup replication
 
-Primary/backup replication (also known as primary copy replication master-slave replication or log shipping) is perhaps the most commonly used replication method, and the most basic algorithm. All updated are performed on the primary, and a log of operations (or alternatively, changes) is shipped across the network to the backup replicas. There are two variants:
+Primary/backup replication (also known as primary copy replication master-slave replication or log shipping) is perhaps the most commonly used replication method, and the most basic algorithm. All updates are performed on the primary, and a log of operations (or alternatively, changes) is shipped across the network to the backup replicas. There are two variants:
 
 - asynchronous primary/backup replication and
 - synchronous primary/backup replication