This document discusses incremental clustering techniques for search engines. It introduces Suffix Tree Clustering (STC), which clusters documents incrementally based on common phrases identified using a suffix tree data structure. STC processes documents one by one, updating the suffix tree and base clusters. It aims to provide fast, relevant, and browsable clustering of search results while documents are still being retrieved. Experimental results showed STC can cluster documents in linear time incrementally as opposed to traditional offline clustering of entire datasets.