diff --git a/docs/badaas-orm/connecting_to_a_database.rst b/docs/badaas-orm/connecting_to_a_database.rst
index eaa18111..a9ea4161 100644
--- a/docs/badaas-orm/connecting_to_a_database.rst
+++ b/docs/badaas-orm/connecting_to_a_database.rst
@@ -5,8 +5,8 @@ Connecting to a database
 Connection
 -----------------------------
 
-badaas-orm supports the PostgreSQL databases using gorm's driver. 
-Some databases may be compatible with the postgres dialect, 
+badaas-orm supports the databases MySQL, PostgreSQL, SQLite, SQL Server using gorm's driver. 
+Some databases may be compatible with the mysql or postgres dialect, 
 in which case you could just use the dialect for those databases (from which CockroachDB is tested).
 
 To communicate with the database badaas-orm need a orm.DB object. 
diff --git a/docs/badaas-orm/query.rst b/docs/badaas-orm/query.rst
index 7ae9ed45..9bfe034f 100644
--- a/docs/badaas-orm/query.rst
+++ b/docs/badaas-orm/query.rst
@@ -161,15 +161,22 @@ Below you will find the complete list of available operators:
 - orm.IsNotNull()
 - orm.Between(v1, v2): Equivalent to v1 < attribute < v2
 - orm.NotBetween(v1, v2): Equivalent to NOT (v1 < attribute < v2)
-- orm.IsTrue()
-- orm.IsNotTrue()
-- orm.IsFalse()
-- orm.IsNotFalse()
-- orm.IsUnknown()
-- orm.IsNotUnknown()
-- orm.IsDistinct(value)
-- orm.IsNotDistinct(value)
+- orm.IsTrue() (Not supported by: sqlserver)
+- orm.IsNotTrue() (Not supported by: sqlserver)
+- orm.IsFalse() (Not supported by: sqlserver)
+- orm.IsNotFalse() (Not supported by: sqlserver)
+- orm.IsUnknown() (Not supported by: sqlserver, sqlite)
+- orm.IsNotUnknown() (Not supported by: sqlserver, sqlite)
+- orm.IsDistinct(value) (Not supported by: mysql)
+- orm.IsNotDistinct(value) (Not supported by: mysql)
 - orm.Like(pattern)
 - orm.Like(pattern).Escape(escape)
 - orm.ArrayIn(values)
-- orm.ArrayNotIn(values)
\ No newline at end of file
+- orm.ArrayNotIn(values)
+
+In addition to these, badaas-orm gives the possibility to use operators 
+that are only supported by a certain database (outside the standard). 
+These operators can be found in <https://pkg.go.dev/github.com/ditrit/badaas/orm/mysql>, 
+<https://pkg.go.dev/github.com/ditrit/badaas/orm/sqlserver>, 
+<https://pkg.go.dev/github.com/ditrit/badaas/orm/psql> 
+and <https://pkg.go.dev/github.com/ditrit/badaas/orm/sqlite>.
\ No newline at end of file
diff --git a/docs/contributing/developing.md b/docs/contributing/developing.md
index cf88b0eb..b1fe33c9 100644
--- a/docs/contributing/developing.md
+++ b/docs/contributing/developing.md
@@ -63,12 +63,14 @@ make -k test_unit
 
 ### Integration tests
 
-Integration tests have a database and the dependency injection system.
+Integration tests have a database and the dependency injection system. Badaas-orm is tested on multiple databases. By default, the database used will be postgresql:
 
 ```sh
 make test_integration
 ```
 
+To run the tests on another database you can use: `make test_integration_postgresql`, `make test_integration_cockroachdb`, `make test_integration_mysql`, `make test_integration_sqlite`, `make test_integration_sqlserver`. All of them will be verified by our continuous integration system.
+
 ### Feature tests (end to end tests)
 
 These are black box tests that test BaDaaS using its http api. We use docker to run a Badaas instance in combination with one node of CockroachDB.