diff --git a/docs/features/search/how-to-guides.md b/docs/features/search/how-to-guides.md
index a3c42c682c..51a71ee314 100644
--- a/docs/features/search/how-to-guides.md
+++ b/docs/features/search/how-to-guides.md
@@ -131,3 +131,26 @@ indexBuilder.addCollator({
 
 As shown above, you can add a catalog entity filter to narrow down what catalog
 entities are indexed by the search engine.
+
+## How to limit where TechDocs Collator scanning the Software Catalog
+
+The DefaultTechDocsCollator is responsible for indexing the TechDocs into search.
+The way it does is by getting all the entities every refresh interval from the
+catalog and find the entities that has annotation `backstage.io/techdocs-ref`,
+the process of getting all the entities is quite expensive if you have a large
+amount of entity catalog data. To relieve the process, you can filter where the
+DefaultTechDocsCollator is scanning your entities.
+
+```typescript
+indexBuilder.addCollator({
+  defaultRefreshIntervalSeconds: 600,
+  collator: DefaultTechDocsCollator.fromConfig(config, {
+    discovery,
+    logger,
+    tokenManager,
++   filter: {
++      kind: ['API', 'Component', 'Domain', 'System'],
++   },
+  }),
+});
+```