* <p>Annotations should describe the major components or topics of the content. It is up to
* apps initiating {@link #ACTION_CHOOSER} to learn and add annotations. Annotations should be
* learned in advance, e.g., when creating or saving content, to avoid increasing latency to
- * start {@link #ACTION_CHOOSER}. Performance on customized annotations can suffer, if they are
- * rarely used for {@link #ACTION_CHOOSER} in the past 14 days. Therefore, it is recommended to
- * use the following annotations when applicable.</p>
+ * start {@link #ACTION_CHOOSER}. Names of customized annotations should not contain the colon
+ * character. Performance on customized annotations can suffer, if they are rarely used for
+ * {@link #ACTION_CHOOSER} in the past 14 days. Therefore, it is recommended to use the
+ * following annotations when applicable.</p>
* <ul>
* <li>"product" represents that the topic of the content is mainly about products, e.g.,
* health & beauty, and office supplies.</li>