Configuration/Expressions.md

@@ -12,4 +12,11 @@ ignores:
 ```yaml
 - accepts:
   - TrackerName == "BTN"
-```
\ No newline at end of file
+```
+
+Expressions are used by Trackarr to determine which releases should be sent to a PVR.
+
+A single release can be sent to multiple PVR's, provided it meets their associated filters.
+
+This is achieved using the expr module by [antonmedv](https://github.com/antonmedv/expr), the language definition can be found [here](https://github.com/antonmedv/expr/blob/master/docs/Language-Definition.md).
+