diff --git a/framework/src/mesh/GeneratedMesh.C b/framework/src/mesh/GeneratedMesh.C
index daa5d0e07278..8157c4987736 100644
--- a/framework/src/mesh/GeneratedMesh.C
+++ b/framework/src/mesh/GeneratedMesh.C
@@ -32,8 +32,7 @@ GeneratedMesh::validParams()
   MooseEnum elem_types(LIST_GEOM_ELEM); // no default
 
   MooseEnum dims("1=1 2 3");
-  params.addRequiredParam<MooseEnum>(
-      "dim", dims, "The dimension of the mesh to be generated"); // Make this parameter required
+  params.addRequiredParam<MooseEnum>("dim", dims, "The dimension of the mesh to be generated");
 
   params.addParam<unsigned int>("nx", 1, "Number of elements in the X direction");
   params.addParam<unsigned int>("ny", 1, "Number of elements in the Y direction");
diff --git a/modules/thermal_hydraulics/src/base/THMMesh.C b/modules/thermal_hydraulics/src/base/THMMesh.C
index 512973dfcc7f..2dbf249339cd 100644
--- a/modules/thermal_hydraulics/src/base/THMMesh.C
+++ b/modules/thermal_hydraulics/src/base/THMMesh.C
@@ -26,6 +26,8 @@ THMMesh::validParams()
 {
   InputParameters params = MooseMesh::validParams();
   params.addClassDescription("Creates a mesh (nodes and elements) for the Components");
+  MooseEnum dims("1=1 2 3", "3");
+  params.addParam<MooseEnum>("dim", dims, "The dimension of the mesh to be generated");
   // we do not allow renumbering, because we generate our meshes
   params.set<bool>("allow_renumbering") = false;
   return params;
diff --git a/python/MooseDocs/test/extensions/test_appsyntax.py b/python/MooseDocs/test/extensions/test_appsyntax.py
index 818ed0e8842a..1a23b8e027da 100755
--- a/python/MooseDocs/test/extensions/test_appsyntax.py
+++ b/python/MooseDocs/test/extensions/test_appsyntax.py
@@ -76,7 +76,7 @@ def testAST(self):
     def testHTML(self):
         _, res = self.execute(self.TEXT, renderer=base.HTMLRenderer())
 
-        self.assertSize(res, 9)
+        self.assertSize(res, 11)
         self.assertHTMLTag(res(0), 'h2', id_='input-parameters', size=3)
         self.assertEqual(res(0).text(), 'Input Parameters')
 
@@ -111,7 +111,7 @@ def testHTML(self):
 
     def testMaterialize(self):
         _, res = self.execute(self.TEXT, renderer=base.MaterializeRenderer())
-        self.assertSize(res, 9)
+        self.assertSize(res, 11)
         self.assertHTMLTag(res(0), 'h2', id_='input-parameters', size=3)
         self.assertEqual(res(0).text(), 'Input Parameters')