private void ensureCapabilitiesIsMutable() {
      if (!((bitField0_ & 0x00000400) != 0)) {
        capabilities_ = new java.util.ArrayList<java.lang.Integer>(capabilities_);
        bitField0_ |= 0x00000400;
      }
    }
<pre>
Output only. Families of the node type.
For node types to be in the same cluster
they must share at least one element in the `families`.
</pre>

<code>repeated string families = 13 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@param value The bytes of the families to add.
@return This builder for chaining.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/NodeType.java