# EPUBCheck OPF-096: Non-linear content must be reachable…

Source: https://epublab.com/epubcheck/opf-096/ (updated 2026-11-03)

EPUBCheck OPF-096 is an error message: “Non-linear content must be reachable, but found no hyperlink to "…".” A document marked linear="no" in the spine is not linked from anywhere, so readers cannot reach it.

- Official message (EPUBCheck 5.4.0): Non-linear content must be reachable, but found no hyperlink to "%1$s".
- Default severity: Error

## Typical causes

- Notes, answers or appendices marked non-linear without a link from the text or table of contents.

## How to fix it

- Link to the document from the text or the navigation document, or remove linear="no".

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.