diff --git a/NPLib/README b/NPLib/README
index b6e12f885caf54759db1f9293bc1f60988fbee99..d3f0c965dd76c4b9681bd58368bc6031a3a5c913 100644
--- a/NPLib/README
+++ b/NPLib/README
@@ -118,7 +118,8 @@ XI) GASPARD
 		obtained from NPSimulation. This library is *only* used by NPAnalysis.
 
 XII) VDetector
-		This directory includes one library:
-		libVDetector.so
+		This directory includes two libraries:
+		libVDetector.so and libDetectorManager.so
 			VDetector is a virtual class used for analysis purpose. It comes with several standards method definition called in analysis programm automatically.
 			Those method need to be implemented for each detector inheritted from the VDetector class.
+			DetectorManager is a class that manage a vector of VDetector and call there common functions.