diff --git a/csi.proto b/csi.proto
index bc2b1d78..750a2592 100644
--- a/csi.proto
+++ b/csi.proto
@@ -385,7 +385,7 @@ message CreateVolumeRequest {
 
   // Plugin specific parameters to apply, passed in as opaque
   // key-value pairs. This field is OPTIONAL. The Plugin is
-  // responsible for  parsing and validating these parameters. 
+  // responsible for parsing and validating these parameters. 
   // COs will treat these as opaque. Plugins MUST treat these 
   // as if they take precedence over the parameters field.
   // This field SHALL NOT be specified unless the SP has the
diff --git a/lib/go/csi/csi.pb.go b/lib/go/csi/csi.pb.go
index 95438897..99dcc977 100644
--- a/lib/go/csi/csi.pb.go
+++ b/lib/go/csi/csi.pb.go
@@ -926,7 +926,7 @@ type CreateVolumeRequest struct {
 	AccessibilityRequirements *TopologyRequirement `protobuf:"bytes,7,opt,name=accessibility_requirements,json=accessibilityRequirements,proto3" json:"accessibility_requirements,omitempty"`
 	// Plugin specific parameters to apply, passed in as opaque
 	// key-value pairs. This field is OPTIONAL. The Plugin is
-	// responsible for  parsing and validating these parameters.
+	// responsible for parsing and validating these parameters.
 	// COs will treat these as opaque. Plugins MUST treat these
 	// as if they take precedence over the parameters field.
 	// This field SHALL NOT be specified unless the SP has the
diff --git a/spec.md b/spec.md
index 788476ba..d9ac1ac6 100644
--- a/spec.md
+++ b/spec.md
@@ -856,7 +856,7 @@ message CreateVolumeRequest {
 
   // Plugin specific parameters to apply, passed in as opaque
   // key-value pairs. This field is OPTIONAL. The Plugin is
-  // responsible for  parsing and validating these parameters. 
+  // responsible for parsing and validating these parameters. 
   // COs will treat these as opaque. Plugins MUST treat these 
   // as if they take precedence over the parameters field.
   // This field SHALL NOT be specified unless the SP has the
@@ -1647,7 +1647,7 @@ The CO MUST implement the specified error recovery behavior when it encounters t
 
 #### `ControllerModifyVolume`
 
-A Controller plugin MUST implement this RPC call if plugin has MODIFY_VOLUME controller capability.
+A Controller plugin MUST implement this RPC call if the plugin has the MODIFY_VOLUME controller capability.
 This RPC allows the CO to change mutable key attributes of a volume. 
 
 This operation MUST be idempotent. 
@@ -1689,7 +1689,7 @@ message ControllerModifyVolumeResponse {
 |-----------|-----------|-------------|-------------------|
 | Parameters not supported | 3 INVALID_ARGUMENT | Indicates that the CO has specified mutable parameters not supported by the volume. | Caller MAY verify mutable parameters. |
 | Exceeds capabilities | 3 INVALID_ARGUMENT | Indicates that the CO has specified capabilities not supported by the volume. | Caller MAY verify volume capabilities by calling ValidateVolumeCapabilities and retry with matching capabilities. |
-| Volume does not exist | 5 NOT FOUND | Indicates that a volume corresponding to the specified volume_id does not exist. | Caller MUST verify that the volume_id is correct and that the volume is accessible and has not been deleted before retrying with exponential back off. |
+| Volume does not exist | 5 NOT_FOUND | Indicates that a volume corresponding to the specified volume_id does not exist. | Caller MUST verify that the volume_id is correct and that the volume is accessible and has not been deleted before retrying with exponential back off. |
 
 #### `GetCapacity`