diff --git a/examples/directed_energy_deposition/cylinder/master_app_mechanical.i b/examples/directed_energy_deposition/cylinder/master_app_mechanical.i
index a75e270e..10f6450b 100644
--- a/examples/directed_energy_deposition/cylinder/master_app_mechanical.i
+++ b/examples/directed_energy_deposition/cylinder/master_app_mechanical.i
@@ -1,3 +1,7 @@
+# The material properties used in this example are based on typical values for stainless steel.
+# For detailed reference, please consult the following paper:
+# https://www.sciencedirect.com/science/article/pii/S2214860418301246
+
 # unit of length (mm), time (ms)
 
 T_room = 300
diff --git a/examples/directed_energy_deposition/cylinder/sub_app_thermal.i b/examples/directed_energy_deposition/cylinder/sub_app_thermal.i
index ffc580e9..93170a9b 100644
--- a/examples/directed_energy_deposition/cylinder/sub_app_thermal.i
+++ b/examples/directed_energy_deposition/cylinder/sub_app_thermal.i
@@ -1,3 +1,7 @@
+# The material properties used in this example are based on typical values for stainless steel.
+# For detailed reference, please consult the following paper:
+# https://www.sciencedirect.com/science/article/pii/S2214860418301246
+
 # unit of length (mm), time (ms)
 
 T_room = 300
diff --git a/examples/directed_energy_deposition/hollow_cylinder/master_app_mechanical.i b/examples/directed_energy_deposition/hollow_cylinder/master_app_mechanical.i
index 733c7979..148417df 100644
--- a/examples/directed_energy_deposition/hollow_cylinder/master_app_mechanical.i
+++ b/examples/directed_energy_deposition/hollow_cylinder/master_app_mechanical.i
@@ -1,3 +1,7 @@
+# The material properties used in this example are based on typical values for stainless steel.
+# For detailed reference, please consult the following paper:
+# https://www.sciencedirect.com/science/article/pii/S2214860418301246
+
 # unit of length (mm), time (ms)
 
 T_room = 300
diff --git a/examples/directed_energy_deposition/hollow_cylinder/sub_app_thermal.i b/examples/directed_energy_deposition/hollow_cylinder/sub_app_thermal.i
index 7cd06bb6..cbfe3c7b 100644
--- a/examples/directed_energy_deposition/hollow_cylinder/sub_app_thermal.i
+++ b/examples/directed_energy_deposition/hollow_cylinder/sub_app_thermal.i
@@ -1,3 +1,7 @@
+# The material properties used in this example are based on typical values for stainless steel.
+# For detailed reference, please consult the following paper:
+# https://www.sciencedirect.com/science/article/pii/S2214860418301246
+
 T_room = 300
 T_ambient = 300
 T_melt = 1700