diff --git a/app/otbClearCutsMultitemporalDetection.cxx b/app/otbClearCutsMultitemporalDetection.cxx
index a0366ff6c8e98143c68d3e7bc4de522b3a8c6143..7d0ad1b4e3bf3024bb17ababa08afb8baca12891 100644
--- a/app/otbClearCutsMultitemporalDetection.cxx
+++ b/app/otbClearCutsMultitemporalDetection.cxx
@@ -103,7 +103,7 @@ public:
     AddParameter(ParameterType_InputImageList, "il", "Input time series");
 
     // Input time series dates
-    AddParameter(ParameterType_StringList, "dates", "Input time series dates");
+    AddParameter(ParameterType_StringList, "dates", "Input time series dates (Must be dd/mm/yyyy format)");
 
     // Input (optional) masks
     AddParameter(ParameterType_Directory, "masksdir", "Vegetation masks directory");