diff --git a/README.md b/README.md
index 27b6041..8ef17b8 100644
--- a/README.md
+++ b/README.md
@@ -137,6 +137,7 @@ For Database Management
 * [pgTAP](https://pgtap.org/) - Database testing framework for Postgres
 * [HypoPG](https://github.com/HypoPG/hypopg) - HypoPG provides hypothetical/virtual indexes feature.
 * [pgRouting](https://github.com/pgRouting/pgrouting) - pgRouting extends the PostGIS/PostgreSQL geospatial database to provide geospatial routing and other network analysis functionality.
+* [PGroonga](https://pgroonga.github.io/) - PGroonga provides a new index access method that uses Groonga allowing super fast full text search feature against all languages.
 * [PGAudit](https://www.pgaudit.org/) - The PostgreSQL Audit Extension (or pgaudit) provides detailed session and/or object audit logging via the standard logging facility provided by PostgreSQL.
 
 ### Optimization