diff --git a/source/statistics/dof.rst b/source/statistics/dof.rst
new file mode 100644
index 0000000..a4304a4
--- /dev/null
+++ b/source/statistics/dof.rst
@@ -0,0 +1,4 @@
+Degree of freedom
+===================
+
+BAM
diff --git a/source/statistics/index.rst b/source/statistics/index.rst
index ee3e426..fb86b61 100644
--- a/source/statistics/index.rst
+++ b/source/statistics/index.rst
@@ -6,5 +6,6 @@ Statistics
    :maxdepth: 2
 
    metrics
+   dof
 
 Statistics notes.