diff --git a/docs/contributing.md b/docs/contributing.md
index 45aad3d..2e43083 100644
--- a/docs/contributing.md
+++ b/docs/contributing.md
@@ -75,6 +75,11 @@ To run the linting, use:
 $ hatch fmt
 ```
 
+!!! Note
+    If you get stuck into segfaults, you might want to use the environment parameter: `TEST_NO_RISK_SEGFAULTS=true`.
+    MSSQL and odbc may can segfault, though seldom.
+    This parameter is active for github actions.
+
 ### Documentation
 
 Improving the documentation is quite easy and it is placed inside the `databasez/docs` folder.
diff --git a/docs/index.md b/docs/index.md
index 466f437..64ca6fe 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -116,10 +116,7 @@ $ pip install databasez[aioodbc]
 ```
 
 !!! Note
-    Note that if you are using any synchronous SQLAlchemy functions such as `engine.create_all()`
-    or [alembic][alembic] migrations then you still have to install a synchronous DB driver:
-    [psycopg][psycopg] for PostgreSQL, [pymysql][pymysql] for MySQL and
-    [pyodbc][pyodbc] for SQL Server.
+    MSSQL and odbc may segfaults with threading (sometimes but in tests it can be more often).
 
 ---