Systems, methods, and software are disclosed herein for indicating a change to content in a document to a user. A document is displayed in a user interface to an application. Content then is introduced into the document from a source external to the document. After the content has been introduced into the document, the source of the content is queried for any changes to the content at the source. If a change has occurred, an indication of the change to the content at the source is introduced in the document.