diff --git a/dynamic_model/README.md b/dynamic_model/README.md
index 3225198..c291864 100644
--- a/dynamic_model/README.md
+++ b/dynamic_model/README.md
@@ -33,7 +33,7 @@ where $\rho_0$ is the reactivity necessary for steady state operation, found by
 and $\rho_{ext}$ is external reactivity, e.g. from a reactivity insertion, and $\rho_{fb}$ is the feedback reactivity due to temperature differences in the core nodes, expressed as 
 
 ```math
-\rho_{fb}(t) = \alpha_f \sum_{i=1}^{n} I_{fi} (T_{f,0} - T_{f_i}(t)) + \alpha_g \sum_{i=1}^{n} I_{gi} (T_{g,0} - T_{g_i}(t)), \quad \text{where} \sum_{\text{regions}} I_{fi} = \sum_{\text{regions}} I_{gi} = 1.0
+\rho_{fb}(t) = \alpha_f \sum_{i=1}^{n} I_{fi} (T_{f_i,0} - T_{f_i}(t)) + \alpha_g \sum_{i=1}^{n} I_{gi} (T_{g,0} - T_{g_i}(t)), \quad \text{where} \sum_{\text{regions}} I_{fi} = \sum_{\text{regions}} I_{gi} = 1.0
 ```
 
 where $\alpha_f$ and $\alpha_g$ are the fuel and graphite temperature-reactivity coefficients respectively, and $I$ represents the weighted nuclear importance factor of each region.