diff --git a/docs/codes/index.md b/docs/codes/index.md
index e5c99e6..806fff7 100644
--- a/docs/codes/index.md
+++ b/docs/codes/index.md
@@ -20,7 +20,7 @@ A differentiable routing method that uses Muskingum-Cunge and an NN to infer par
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--   [$\delta$ differentiable stream temperature (LSTM $\Plus$ SNTEMP) __(Rahmani et al. 2023)__][Rahmani_et_al_2023.md]
+-   [$\delta$ differentiable stream temperature (LSTM + SNTEMP) __(Rahmani et al. 2023)__][Rahmani_et_al_2023.md]
    
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 ![Scatterplots comparing baseflow ratio predicted by four models with different structural priors](../assets/project-figures/Fig5_Rahmani2023.png)