diff --git a/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/c_DirichletWithinTimeInterval.md b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/c_DirichletWithinTimeInterval.md
new file mode 100644
index 0000000000000000000000000000000000000000..25890f555d2a884c11094c211e54d2f93e283ef2
--- /dev/null
+++ b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/c_DirichletWithinTimeInterval.md
@@ -0,0 +1,4 @@
+It defines a Dirichlet boundary condition that exists only in a time interval.
+
+Benchmark:
+Tests/Data/Parabolic/LiquidFlow/TimeIntervalDirichletBC/TimeIntervalDirichletBC.prj
diff --git a/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_end_time.md b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_end_time.md
new file mode 100644
index 0000000000000000000000000000000000000000..75ecc239ac9a892255b58b42b57d3a047188237e
--- /dev/null
+++ b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_end_time.md
@@ -0,0 +1 @@
+The end time of the time interval.
diff --git a/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_parameter.md b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_parameter.md
new file mode 100644
index 0000000000000000000000000000000000000000..e98762882032d5f71542a2e276bb598bda03a454
--- /dev/null
+++ b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_parameter.md
@@ -0,0 +1,2 @@
+The value of the Dirichlet boundary condition within the
+ specified time interval.
diff --git a/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_start_time.md b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_start_time.md
new file mode 100644
index 0000000000000000000000000000000000000000..81b1a66893599c1c85ce16cb56ac8e4cb5934307
--- /dev/null
+++ b/Documentation/ProjectFile/prj/process_variables/process_variable/boundary_conditions/boundary_condition/DirichletWithinTimeInterval/t_start_time.md
@@ -0,0 +1 @@
+The start time of the time interval.