diff --git a/docs/doctrine-bridge.md b/docs/doctrine-bridge.md
index 8883bd4..3a68bbb 100644
--- a/docs/doctrine-bridge.md
+++ b/docs/doctrine-bridge.md
@@ -2,7 +2,10 @@
 
 This library provides a PSR-6 compliant bridge between Doctrine and a Cache Pool. The bridge implements the 
 `Doctrine\Common\Cache\Cache` interface. This is useful for projects that require an implementation of 
-`Doctrine\Common\Cache\Cache`, but when you still want to use a PSR-6 implementation. 
+`Doctrine\Common\Cache\Cache`, but when you still want to use a PSR-6 implementation.
+
+!!! Note
+The filesystem adapter is not supported.
 
 ## Installation