diff --git a/asyncpg/pool.py b/asyncpg/pool.py
index 20a3234e..9cdafefa 100644
--- a/asyncpg/pool.py
+++ b/asyncpg/pool.py
@@ -566,7 +566,7 @@ async def fetchrow(self, query, *args, timeout=None):
         async with self.acquire() as con:
             return await con.fetchrow(query, *args, timeout=timeout)
 
-    def acquire(self, *, timeout=None):
+    def acquire(self, *, timeout=None) -> connection.Connection:
         """Acquire a database connection from the pool.
 
         :param float timeout: A timeout for acquiring a Connection.