A content gap is a question your readers have about a topic that none of your articles answers yet. Filling gaps is how a cluster grows from a handful of articles into a complete resource — and every new article is a new place to link from and to.
Four ways to find gaps
1. Look at the topic from the reader’s side. List what someone planning, learning or buying would ask, in order: what is it, is it for me, how do I do it, what does it cost, what are the alternatives. Mark which questions your cluster answers.
2. Check what your supporting articles assume. Articles often mention something they don’t explain — “take the ferry to the island” with no article on getting there. Those mentions are gaps.
3. Use your search data. Search Console shows queries your pages appear for but don’t really answer. Your own site search shows what visitors look for and don’t find.
4. Compare with related clusters. If your Museums cluster covers opening hours and tickets for every museum but your Parks cluster doesn’t, the pattern suggests what’s missing.
Which gap first
- A missing pillar comes before everything. If the cluster has no broad overview article, write that first — see Pillar pages.
- Gaps that other articles already point to come next: you already have the links waiting.
- Common, practical questions before niche ones.
Writing the new article into the cluster
A new article isn’t finished when it’s published:
- Link to the cluster’s pillar from it.
- Link to it from the pillar and from one or two related articles — so it doesn’t start life as an orphan.
- Give it a title and description that make its angle clear, so it doesn’t compete with an existing article. See Keyword cannibalisation.
In ClusterIQ
With Pro, Gap Analysis reads a cluster’s articles and suggests the ones that are missing, each with a reason. Any suggestion can become a brief — purpose, search phrase, meta description, sections, and which existing articles to link to and from. You write the article; ClusterIQ never writes it for you.
Don’t fill gaps with thin articles
A short page that only exists to cover a keyword helps no one. If a question can be answered in two paragraphs, it may belong as a section in an existing article rather than as a new one.
Back to the overview: Topic clusters.