diff --git a/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/initial_stress/a_type.md b/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/initial_stress/a_type.md
new file mode 100644
index 0000000000000000000000000000000000000000..f301994a9caaa034dfe82a8a8369b367f273d9f3
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/initial_stress/a_type.md
@@ -0,0 +1,6 @@
+An optional attribute to indicate the type of the initial stress, `total` or
+ `effective`. The default value is `effective`.
+
+\note If subtype = `StressSaturation_StrainPressureTemperature` is bing used
+      in the process setting of `ThermoRichardsMechanics`, this attribute must
+      be presented.
diff --git a/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/initial_stress/i_initial_stress.md b/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/initial_stress/i_initial_stress.md
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index 0000000000000000000000000000000000000000..d9828fd553e1221fecf5ba6129ff106ddb0a8e71
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+++ b/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/initial_stress/i_initial_stress.md
@@ -0,0 +1,3 @@
+An optional tag to input the parameter of initial stress in porous media. It is
+ used in processes `LIE`, `HydroMechanics`, `ThermoHydroMechanics`,
+ `RichardsMechanics`, `ThermoRichardsMechanics`, and `TH2M`.
diff --git a/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/t_initial_stress.md b/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/t_initial_stress.md
deleted file mode 100644
index 676cbf5139183f3ebeb303fc61a2a73db5c0a6bd..0000000000000000000000000000000000000000
--- a/Documentation/ProjectFile/prj/processes/process/THERMO_RICHARDS_MECHANICS/t_initial_stress.md
+++ /dev/null
@@ -1 +0,0 @@
-\copydoc ProcessLib::RichardsMechanics::RichardsMechanicsProcessData::initial_stress