diff --git a/interfaces/matlab/toolbox/1D/npflame_init.m b/interfaces/matlab/toolbox/1D/npflame_init.m
index 09fbed6fb..0d064afb4 100644
--- a/interfaces/matlab/toolbox/1D/npflame_init.m
+++ b/interfaces/matlab/toolbox/1D/npflame_init.m
@@ -1,6 +1,10 @@
 function flame = npflame_init(gas, left, flow, right, fuel, oxidizer, nuox)
 % NPFLAME_INIT  Create a non-premixed flame stack.
 % flame = npflame_init(gas, left, flow, right, fuel, oxidizer, nuox)
+%
+% This function is deprecated in favor of :mat:func:`CounterFlowDiffusionFlame`
+% and will be removed after Cantera 2.4.
+%
 % :param gas:
 %     Object representing the gas, instance of class
 %     :mat:func:`Solution`, and an ideal gas. This object will be used
@@ -29,6 +33,8 @@ function flame = npflame_init(gas, left, flow, right, fuel, oxidizer, nuox)
 %     inlet, flow, and right inlet.
 %
 
+warning('This function is deprecated and will be removed after Cantera 2.4. Use CounterFlowDiffusionFlame instead');
+
 % Check input parameters
 if nargin ~= 7
     error('npflame_init expects seven input arguments.');