diff --git a/src/main/java/envoy/data/Group.java b/src/main/java/envoy/data/Group.java
index abc51d0..077ff40 100644
--- a/src/main/java/envoy/data/Group.java
+++ b/src/main/java/envoy/data/Group.java
@@ -15,7 +15,7 @@ import java.util.StringJoiner;
 public class Group extends Contact {
 
 	// TODO add admins
-	private List<Long> memberIDs;
+	private final List<Long> memberIDs;
 
 	private static final long serialVersionUID = 0L;
 
@@ -47,12 +47,6 @@ public class Group extends Contact {
 	 */
 	public List<Long> getMemberIDs() { return memberIDs; }
 
-	/**
-	 * @param memberIDs the member IDs to set
-	 * @since Envoy Common v0.1-beta
-	 */
-	public void setMemberIDs(List<Long> memberIDs) { this.memberIDs = memberIDs; }
-
 	/**
 	 * {@inheritDoc}
 	 */
diff --git a/src/main/java/envoy/event/GroupResizeEvent.java b/src/main/java/envoy/event/GroupResizeEvent.java
index be5ac33..110ea9b 100644
--- a/src/main/java/envoy/event/GroupResizeEvent.java
+++ b/src/main/java/envoy/event/GroupResizeEvent.java
@@ -20,7 +20,7 @@ import envoy.data.User;
 public class GroupResizeEvent extends Event<Long> {
 
 	private final long		groupID;
-	private Operation	operation;
+	private final Operation	operation;
 
 	private static final long serialVersionUID = 0L;
 
@@ -80,13 +80,7 @@ public class GroupResizeEvent extends Event<Long> {
 	 * @return the operationType
 	 * @since Envoy Common v0.1-beta
 	 */
-	public Operation getOperationType() { return operation; }
-
-	/**
-	 * @param operation the operationType to set
-	 * @since Envoy Common v0.1-beta
-	 */
-	public void setOperationType(Operation operation) { this.operation = operation; }
+	public Operation getOperation() { return operation; }
 
 	/**
 	 * {@inheritDoc}