diff --git a/doc/doxygen/extradoc/parameterlist.txt b/doc/doxygen/extradoc/parameterlist.txt
index 24031f8ff03a5fa419300fabcb4991dc7ac3a473..8bd93076821c10074140486c1650a5cf95312a64 100644
--- a/doc/doxygen/extradoc/parameterlist.txt
+++ b/doc/doxygen/extradoc/parameterlist.txt
@@ -303,6 +303,7 @@
  * | RANS                 | FlowDirectionAxis                             | int                      | 0               | The flow direction axis                                                                                                                                |
  * | RANS                 | IsFlatWallBounded                             | bool                     | false           | Set to true, if geometry consists of flat walls                                                                                                        |
  * | RANS                 | SSTModelVersion                               | std::string              | "SST"           | the model version of the SST model                                                                                                                     |
+ * | RANS                 | SandGrainRoughness                            | Scalar                   | -               | The roughness of a sand grain                                                                                                                          |
  * | RANS                 | TurbulentPrandtlNumber                        | Scalar                   | 1.0             | The turbulent Prandtl number                                                                                                                           |
  * | RANS                 | TurbulentSchmidtNumber                        | Scalar                   | 1.0             | The turbulent Schmidt number                                                                                                                           |
  * | RANS                 | UseStoredEddyViscosity                        | bool                     | false           | Whether to use the stored eddy viscosity                                                                                                               |
diff --git a/doc/doxygen/extradoc/parameters.json b/doc/doxygen/extradoc/parameters.json
index 88f76eb0dcdccf1e1c6d60507ede0b19dc31edeb..ff0d28635d921117b5930e33df5c746cb0e4d953 100644
--- a/doc/doxygen/extradoc/parameters.json
+++ b/doc/doxygen/extradoc/parameters.json
@@ -2438,9 +2438,6 @@
             "Set a name for a problem"
         ]
     },
-    "Problem.SandGrainRoughness": {
-        "mode": "ignore"
-    },
     "RANS.EddyViscosityModel": {
         "explanation": [
             "Choose the eddy viscosity model"
@@ -2456,6 +2453,11 @@
             "Set to true, if geometry consists of flat walls"
         ]
     },
+    "RANS.SandGrainRoughness": {
+        "explanation": [
+            "The roughness of a sand grain"
+        ]
+    },
     "RANS.SSTModelVersion": {
         "explanation": [
             "the model version of the SST model"