--- title: "hreflang set isn't self-referencing and reciprocal (seo/hreflang-not-reciprocal)" description: "seo/hreflang-not-reciprocal: If two pages don't both point to each other, Google ignores the tags; each variant must also list itself." canonical: https://void-design.vercel.app/rules/seo/hreflang-not-reciprocal lastModified: 2026-09-16 --- # hreflang set isn't self-referencing and reciprocal `seo/hreflang-not-reciprocal` · severity **error** · category SEO · detected by `void seo` and `void audit` ## Why it matters If two pages don't both point to each other, Google ignores the tags; each variant must also list itself. ## How to fix it Generate the same alternates.languages map on every variant, including the page's own locale. ## References - https://developers.google.com/search/docs/specialty/international/localized-versions ## More seo rules `void seo` reports 60 rules in this category. What search engines need from the raw response: status codes, titles and descriptions in , self-referencing canonicals, one h1, crawlable links, Open Graph, icons, robots.txt and a sitemap with real dates. - `link-text` Links with generic or empty text — [seo/link-text](https://void-design.vercel.app/rules/seo/link-text) - `broken-links` Internal links return 4xx/5xx (or go through redirects) — [seo/broken-links](https://void-design.vercel.app/rules/seo/broken-links) - `trailing-slash` Both trailing-slash and non-slash URLs serve 200 — [seo/trailing-slash](https://void-design.vercel.app/rules/seo/trailing-slash) - `hreflang-invalid` hreflang uses invalid codes or relative URLs — [seo/hreflang-invalid](https://void-design.vercel.app/rules/seo/hreflang-invalid) - `og-missing` Required Open Graph tags missing (og:title, og:type, og:image, og:url) — [seo/og-missing](https://void-design.vercel.app/rules/seo/og-missing) - `og-incomplete` og:description / og:site_name missing, or og:url ≠ canonical — [seo/og-incomplete](https://void-design.vercel.app/rules/seo/og-incomplete) - `og-image-invalid` og:image isn't a reachable, absolute, raster image within size limits — [seo/og-image-invalid](https://void-design.vercel.app/rules/seo/og-image-invalid) - `og-image-size` og:image is smaller than 1200×630 or far from 1.91:1 — [seo/og-image-size](https://void-design.vercel.app/rules/seo/og-image-size) Detected by `void seo` and `void audit`. Explain it in a terminal: `void rules seo/hreflang-not-reciprocal`