diff --git a/dune/microstructure/matrix_operations.hh b/dune/microstructure/matrix_operations.hh
index 3cd76beddfeda08b1749c784afbe77ee6a9f40bb..ab0a59332e73849964923ba388c31dadff9c4a0e 100644
--- a/dune/microstructure/matrix_operations.hh
+++ b/dune/microstructure/matrix_operations.hh
@@ -116,7 +116,7 @@ namespace MatrixOperations {
 						{         0,               0,  1.0}};
 			}
 			default:
-				DUNE_THROW(Dune::Exception, " axis not feasible. rotationMatrix is only implemented for 3x3-matrices.");
+				DUNE_THROW(Dune::Exception, " axis not feasible. rotationMatrix is only implemented for 3x3-matrices. Choose between 0: x-axis, 1: y-axis, 2: z-axis");
 		}
 	}