diff --git a/maubot/config.py b/maubot/config.py
index c817ccc..2ee635e 100644
--- a/maubot/config.py
+++ b/maubot/config.py
@@ -33,6 +33,7 @@ class Config(BaseFileConfig):
         base = helper.base
         copy = helper.copy
         copy("database")
+        copy("database_opts")
         if isinstance(self["crypto_database"], dict):
             if self["crypto_database.type"] == "postgres":
                 base["crypto_database"] = self["crypto_database.postgres_uri"]
diff --git a/maubot/example-config.yaml b/maubot/example-config.yaml
index 0f82e12..a1d6ce2 100644
--- a/maubot/example-config.yaml
+++ b/maubot/example-config.yaml
@@ -8,6 +8,14 @@ database: sqlite:///maubot.db
 # Separate database URL for the crypto database. "default" means use the same database as above.
 crypto_database: default
 
+# Additional arguments for asyncpg.create_pool() or sqlite3.connect()
+# https://magicstack.github.io/asyncpg/current/api/index.html#asyncpg.pool.create_pool
+# https://docs.python.org/3/library/sqlite3.html#sqlite3.connect
+# For sqlite, min_size is used as the connection thread pool size and max_size is ignored.
+database_opts:
+    min_size: 1
+    max_size: 10
+
 plugin_directories:
     # The directory where uploaded new plugins should be stored.
     upload: ./plugins