diff --git a/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/c_CompareJacobians.md b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/c_CompareJacobians.md
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index 0000000000000000000000000000000000000000..8185396890cb2e64695d68e07749f821ec090f0d
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/c_CompareJacobians.md
@@ -0,0 +1,6 @@
+A Jacobian assembler that assembles the Jacobian in two different ways, compares
+the resulting local Jacobians and writes extensive logs in the form of a Python
+script if the provided tolerances are exceeded.
+
+Logging (and optionally program termination) is triggered only if both the
+absolute and the relative tolerance are exceeded.
diff --git a/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_abs_tol.md b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_abs_tol.md
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index 0000000000000000000000000000000000000000..1b1bdcd57ad9ef091d97e06fe6bcc79aa57d3367
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_abs_tol.md
@@ -0,0 +1,4 @@
+The absolute tolerance (component-wise) for the difference between the two
+assembled local Jacobians.
+
+There is only one absolute tolerance value for all components of the Jacobian.
diff --git a/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_fail_on_error.md b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_fail_on_error.md
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index 0000000000000000000000000000000000000000..7fa33d23b4b1e9b54e716af5391853bbabec7421
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_fail_on_error.md
@@ -0,0 +1,2 @@
+Whether OGS should be aborted if both the absolute and relative tolerance are
+exceeded.
diff --git a/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_jacobian_assembler.md b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_jacobian_assembler.md
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index 0000000000000000000000000000000000000000..bd27c7fd0fbedec4504af0776fab622ae45b0b7b
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_jacobian_assembler.md
@@ -0,0 +1,2 @@
+The Jacobian assember whose assembled matrices will be used subsequently in the
+global equation system.
diff --git a/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_log_file.md b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_log_file.md
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index 0000000000000000000000000000000000000000..05251c45b79f10d38401e6fc000dcbfaa82ab9a9
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_log_file.md
@@ -0,0 +1,8 @@
+The path to the file to which details of differing Jacobians are written.
+
+Finally, the file will contain a Python script that can be used to conveniently
+examine the differences that occured.
+The given path is an absolute path or a path relative to the working directory
+of OGS.
+The log file will be overwritten, even if no differences exceeding the
+tolerances occur.
diff --git a/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_reference_jacobian_assembler.md b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_reference_jacobian_assembler.md
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index 0000000000000000000000000000000000000000..ce02a50d494e7fae95bcf748f477cb62f912abba
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_reference_jacobian_assembler.md
@@ -0,0 +1,2 @@
+The Jacobian assembler whose results are used only to check the assembled
+matrices of the other Jacobian assembler.
diff --git a/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_rel_tol.md b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_rel_tol.md
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index 0000000000000000000000000000000000000000..67a16ad0dfd8592d356a1bde85c823e52ad15e03
--- /dev/null
+++ b/Documentation/ProjectFile/prj/processes/process/jacobian_assembler/CompareJacobians/t_rel_tol.md
@@ -0,0 +1,4 @@
+The relative tolerance (component-wise) for the difference between the two
+assembled local Jacobians.
+
+There is only one relative tolerance value for all components of the Jacobian.