Index: /trunk/Mars/msim/MPhotonEvent.h
===================================================================
--- /trunk/Mars/msim/MPhotonEvent.h	(revision 19661)
+++ /trunk/Mars/msim/MPhotonEvent.h	(revision 19662)
@@ -79,9 +79,9 @@
 {
 private:
-    Float_t fTimeFirst;  //! Start of (simulated) sampling window
-    Float_t fTimeLast;   //! Start of (simulated) sampling window
+    Float_t fTimeFirst;  //! [ns] Start of (simulated) sampling window
+    Float_t fTimeLast;   //! [ns] End   of (simulated) sampling window
 
-    Float_t fLength;     // Time between first and last photon
-    Float_t fTimeMedDev; // Median deviation
+    Float_t fLength;     // [ns] Time between first and last photon
+    Float_t fTimeMedDev; // [ns] Median deviation
 
 //    Float_t fOffset;