diff --git a/interfaces/cython/cantera/onedim.pyx b/interfaces/cython/cantera/onedim.pyx
index f9832e4a9..2764b25dc 100644
--- a/interfaces/cython/cantera/onedim.pyx
+++ b/interfaces/cython/cantera/onedim.pyx
@@ -264,7 +264,7 @@ cdef class Boundary1D(Domain1D):
             self.boundary.setTemperature(T)
 
     property mdot:
-        """ The mass flow rate per unit area [kg/m^2] """
+        """ The mass flow rate per unit area [kg/s/m^2] """
         def __get__(self):
             return self.boundary.mdot()
         def __set__(self, mdot):