To take advantage of some of the more advanced features of Word, you require the use of fields. Table of contents, cross references, captions, formulas etc. all use fields to provide automation to the document.
When a document changes these fields need to be updated. This can be done by pressing the F9 key, or by right-clicking on the required field and choosing Update Field.
If the document changes regularly, or is large and time consuming to keep track of the many fields used, it could be a good idea to set Word to automatically update the fields on opening the document.
The following post explains how to create a macro that is run on opening a word document. The result is that all document fields are automatically updated upon opening the document.
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