diff --git a/databasez/sqlalchemy.py b/databasez/sqlalchemy.py
index d14ad31..c66d8cc 100644
--- a/databasez/sqlalchemy.py
+++ b/databasez/sqlalchemy.py
@@ -268,12 +268,15 @@ def extract_options(
                 assert param not in options
                 value = typing.cast(str, new_query_options.pop(param))
                 options[param] = value.lower() in {"true", ""}
-        if "pool_size" in new_query_options:
-            assert "pool_size" not in options
-            options["pool_size"] = int(typing.cast(str, new_query_options["pool_size"]))
+        for param in ["pool_size", "max_overflow"]:
+            if param in new_query_options:
+                assert param not in options
+                options[param] = int(typing.cast(str, new_query_options.pop(param)))
         if "pool_recycle" in new_query_options:
             assert "pool_recycle" not in options
-            options["pool_recycle"] = int(typing.cast(str, new_query_options["pool_recycle"]))
+            options["pool_recycle"] = float(
+                typing.cast(str, new_query_options.pop("pool_recycle"))
+            )
         return database_url.replace(options=new_query_options), options
 
     def json_serializer(self, inp: dict) -> str:
diff --git a/docs/connections-and-transactions.md b/docs/connections-and-transactions.md
index dfdf96c..9a4595e 100644
--- a/docs/connections-and-transactions.md
+++ b/docs/connections-and-transactions.md
@@ -125,11 +125,12 @@ Options which will be transformed are in `databasez/sqlalchemy.py` in `extract_o
 
 Some transformed options are:
 
-- ssl: enable ssl
-- echo: enable echo
-- echo_pool: enable echo for pool
-- pool_size: maximal amount of connections
-- pool_recycle: maximal duration a connection may live
+- ssl: enable ssl.
+- echo: enable echo.
+- echo_pool: enable echo for pool.
+- pool_size: maximal amount of connections, int (former name: min_size).
+- max_overflow: maximal amount of connections, int (former name: max_size).
+- pool_recycle: maximal duration a connection may live, float.
 
 
 ## Connection options as a dictionary