README tweak

Author: lovelydinosaur

README.md

@@ -235,8 +235,8 @@ as using `metadata.create_all(engine)` to setup the database tables.
 
 **Note for MySQL**:
 
-For MySQL you'll probably need to explicitly specify the
-`pymysql` dialect, since the default MySQL dialect does not support Python 3.
+For MySQL you'll probably need to explicitly specify the `pymysql` dialect when
+using Alembic since the default MySQL dialect does not support Python 3.
 
 If you're using the `databases.DatabaseURL` datatype, you can obtain this using
 `DATABASE_URL.replace(dialect="pymysql")`