diff --git a/lib/common/src/lib.rs b/lib/common/src/lib.rs
index c80e88a..69a3501 100644
--- a/lib/common/src/lib.rs
+++ b/lib/common/src/lib.rs
@@ -7,6 +7,7 @@ pub mod mouse;
 pub mod timer;
 pub mod integer;
 pub mod physics;
+pub mod session;
 pub mod updatable;
 pub mod instruction;
 pub mod gameplay_attributes;
diff --git a/lib/common/src/session.rs b/lib/common/src/session.rs
new file mode 100644
index 0000000..7f2c01d
--- /dev/null
+++ b/lib/common/src/session.rs
@@ -0,0 +1,3 @@
+#[derive(Clone,Copy,Hash,Eq,PartialEq,PartialOrd,Debug)]
+pub enum TimeInner{}
+pub type Time=crate::integer::Time<TimeInner>;