diff --git a/cluster/container.go b/cluster/container.go
index c9c13cd4b8..b2122060bb 100644
--- a/cluster/container.go
+++ b/cluster/container.go
@@ -24,7 +24,7 @@ func (c *Container) Refresh() (*Container, error) {
 // Containers represents a list a containers
 type Containers []*Container
 
-// Get returns a container using it's ID or Name
+// Get returns a container using its ID or Name
 func (containers Containers) Get(IDOrName string) *Container {
 	// Abort immediately if the name is empty.
 	if len(IDOrName) == 0 {
diff --git a/cluster/engine.go b/cluster/engine.go
index 2c10eb10f3..645804b174 100644
--- a/cluster/engine.go
+++ b/cluster/engine.go
@@ -346,7 +346,7 @@ func (e *Engine) Status() string {
 	return stateText[e.state]
 }
 
-// incFailureCount increases engine's failure count, and set engine as unhealthy if threshold is crossed
+// incFailureCount increases engine's failure count, and sets engine as unhealthy if threshold is crossed
 func (e *Engine) incFailureCount() {
 	e.Lock()
 	defer e.Unlock()
@@ -713,7 +713,7 @@ func (e *Engine) refreshLoop() {
 
 		err = e.RefreshContainers(false)
 		if err == nil {
-			// Do not check error as older daemon don't support this call
+			// Do not check error as older daemon doesn't support this call
 			e.RefreshVolumes()
 			e.RefreshNetworks()
 			e.RefreshImages()
@@ -1052,7 +1052,7 @@ func (e *Engine) AddContainer(container *Container) error {
 	return nil
 }
 
-// Inject an image into the internal state.
+// addImage injects an image into the internal state.
 func (e *Engine) addImage(image *Image) {
 	e.Lock()
 	defer e.Unlock()
@@ -1060,7 +1060,7 @@ func (e *Engine) addImage(image *Image) {
 	e.images = append(e.images, image)
 }
 
-// Remove a container from the internal test.
+// removeContainer removes a container from the internal state.
 func (e *Engine) removeContainer(container *Container) error {
 	e.Lock()
 	defer e.Unlock()
@@ -1072,7 +1072,7 @@ func (e *Engine) removeContainer(container *Container) error {
 	return nil
 }
 
-// Wipes the internal container state.
+// cleanupContainers wipes the internal container state.
 func (e *Engine) cleanupContainers() {
 	e.Lock()
 	e.containers = make(map[string]*Container)
diff --git a/cluster/image.go b/cluster/image.go
index ca56d36335..1a093390f8 100644
--- a/cluster/image.go
+++ b/cluster/image.go
@@ -71,7 +71,7 @@ func (image *Image) Match(IDOrName string, matchTag bool) bool {
 	return false
 }
 
-// ImageFilterOptions are the set of filtering options supported by
+// ImageFilterOptions is the set of filtering options supported by
 // Images.Filter()
 type ImageFilterOptions struct {
 	All        bool
diff --git a/cluster/mesos/cluster.go b/cluster/mesos/cluster.go
index be907bc321..004fceb5c6 100644
--- a/cluster/mesos/cluster.go
+++ b/cluster/mesos/cluster.go
@@ -529,7 +529,7 @@ func (c *Cluster) LaunchTask(t *task.Task) bool {
 		return true
 	}
 
-	// build the offer from it's internal config and set the agentID
+	// build the offer from its internal config and set the agentID
 
 	c.Lock()
 	// TODO: Only use the offer we need
diff --git a/cluster/network.go b/cluster/network.go
index b790564ac9..c705151385 100644
--- a/cluster/network.go
+++ b/cluster/network.go
@@ -78,7 +78,7 @@ func (networks Networks) Filter(names []string, ids []string, types []string) Ne
 	return out
 }
 
-// Get returns a network using it's ID or Name
+// Get returns a network using its ID or Name
 func (networks Networks) Get(IDOrName string) *Network {
 	// Abort immediately if the name is empty.
 	if len(IDOrName) == 0 {
diff --git a/cluster/volume.go b/cluster/volume.go
index 0ceac3209d..02441493c3 100644
--- a/cluster/volume.go
+++ b/cluster/volume.go
@@ -12,7 +12,7 @@ type Volume struct {
 // Volumes represents an array of volumes
 type Volumes []*Volume
 
-// Get returns a volume using it's ID or Name
+// Get returns a volume using its ID or Name
 func (volumes Volumes) Get(name string) *Volume {
 	// Abort immediately if the name is empty.
 	if len(name) == 0 {