diff --git a/docs/physics/statistical-mechanics/formalism.md b/docs/physics/statistical-mechanics/formalism.md
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@@ -0,0 +1,5 @@
+# Formalism of statistical mechanics
+
+## References
+
+* D. Chandler, *Introduction to Modern Statistical Mechanics*, Oxford University Press, 1987.
diff --git a/mkdocs.yml b/mkdocs.yml
index f4e96a6..ec90533 100755
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -200,7 +200,8 @@ nav:
     - 'Thermodynamics':
       - 'Equilibrium formalism': physics/thermodynamics/equilibrium-formalism.md
       - 'Non-equilibrium formalism': physics/thermodynamics/non-equilibrium-formalism.md
-    #- 'Statistical mechanics':
+    - 'Statistical mechanics':
+        - 'Formalism': physics/statistical-mechanics/formalism.md
     - 'Electromagnetism': 
       - 'Electrostatics': physics/electromagnetism/electrostatics.md
       - 'Magnetostatics': physics/electromagnetism/magnetostatics.md