diff --git a/lib/mongo_client.js b/lib/mongo_client.js
index 5d93efc6e7..5bd325693e 100644
--- a/lib/mongo_client.js
+++ b/lib/mongo_client.js
@@ -668,7 +668,7 @@ function createServer(self, options, callback) {
   // Set default options
   var servers = translateOptions(options);
 
-  // Propegate the events to the client
+  // Propagate the events to the client
   var collectedEvents = collectEvents(self, servers[0]);
 
   // Connect to topology
@@ -676,7 +676,7 @@ function createServer(self, options, callback) {
     if (err) return callback(err);
     // Clear out all the collected event listeners
     clearAllEvents(servers[0]);
-    // Relaty all the events
+    // Relay all the events
     relayEvents(self, servers[0]);
     // Add listeners
     addListeners(self, servers[0]);
@@ -714,7 +714,7 @@ function createReplicaset(self, options, callback) {
   // Add listeners
   addListeners(self, topology);
 
-  // Propegate the events to the client
+  // Propagate the events to the client
   relayEvents(self, topology);
 
   // Open the connection
@@ -739,7 +739,7 @@ function createMongos(self, options, callback) {
   // Add listeners
   addListeners(self, topology);
 
-  // Propegate the events to the client
+  // Propagate the events to the client
   relayEvents(self, topology);
 
   // Open the connection