diff --git a/source/core/master-slave.txt b/source/core/master-slave.txt
index 79668a73043..3af71e7e146 100644
--- a/source/core/master-slave.txt
+++ b/source/core/master-slave.txt
@@ -111,7 +111,7 @@ with a master if:
 - The slave stops (i.e. shuts down) and restarts later after the
   master has overwritten the relevant operations from the master.
 
-When slaves, are out of sync, replication stops. Administrators must
+When slaves are out of sync, replication stops. Administrators must
 intervene manually to restart replication. Use the :dbcommand:`resync`
 command. Alternatively, the :option:`--autoresync <mongod --autoresync>`
 allows a slave to restart replication automatically,
@@ -250,7 +250,7 @@ Convert a Master-Slave Deployment to a Replica Set
 
 To convert a master-slave deployment to a replica set, restart the
 current master as a one-member replica set. Then remove the data
-directors from previous secondaries and add them as new secondaries to
+directories from previous secondaries and add them as new secondaries to
 the new replica set.
 
 1. To confirm that the current instance is master, run: