diff --git a/input_models/input/lamem_input.dat b/input_models/input/lamem_input.dat
index 537a0e17..b13f6e65 100644
--- a/input_models/input/lamem_input.dat
+++ b/input_models/input/lamem_input.dat
@@ -636,8 +636,8 @@
         Type                    =   Clapeyron                   # Use the pressure retrieved by the clapeyron linear equation to trigger the phase transition
         Name_Clapeyron          =   Mantle_Transition_660km     # predefined profiles; see SetClapeyron_Eq in phase_transition.cpp for options 
         number_phases           =   3
-        PhaseAbove              =   4 5 7
-        PhaseBelow              =   1 2 3
+        PhaseAbove              =   4 5 7                       # phase ID after transition
+        PhaseBelow              =   1 2 3                       # phase ID before transition
         clapeyron_slope         =   2.0                         # overwrite clapeyron_slope [MPa/K]
         P0_clapeyron            =   15e9                        # overwrite reference pressure [Pa]
         T0_clapeyron            =   1600                        # overwrite reference temperature [C]