diff --git a/thermo/utils.py b/thermo/utils.py
index 6b09518e..7e288189 100644
--- a/thermo/utils.py
+++ b/thermo/utils.py
@@ -1315,6 +1315,9 @@ def T_dependent_property_derivative(self, T, order=1):
 
         Calls `calculate_derivative` internally to perform the actual
         calculation.
+        
+        .. math::
+            \text{derivative} = \frac{d (\text{property})}{d T}
 
         Parameters
         ----------