Mary Russell explores some of the issues that footnotes and endnotes raise for indexers. Some indexers and some clients take it for granted that footnotes and endnotes should never be indexed: others are at the opposite end of the spectrum and assume that footnotes and endnotes should be indexed in minute detail. Leaving aside specialist areas such as the law and author citation in scholarly texts, the consensus amongst indexers and clients is that if a footnote or endnote adds new information of substance, it should be indexed, otherwise not. Determining how to indicate to the reader where the indexed information is located can be quite complicated. The rule is to keep the notation as simple, as self-explanatory and as logical as possible. And unless the indexer is totally confident that the user needs no guidance, the conventions used by the indexer should be explained in the headnote or, better still, in a running footnote.