diff --git a/README.md b/README.md
index e24717cf..4b1309c6 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,8 @@ If you found this library useful in academic research, please cite: [(arXiv link
 
 **Always useful**  
 [Equinox](https://github.com/patrick-kidger/equinox): neural networks and everything not already in core JAX!  
-[jaxtyping](https://github.com/patrick-kidger/jaxtyping): type annotations for shape/dtype of arrays.  
+[jaxtyping](https://github.com/patrick-kidger/jaxtyping): type annotations for shape/dtype of arrays.
+[diffraxtra](https://github.com/GalacticDynamics/diffraxtra): extras for `diffrax`; OOP and vectorization.
 
 **Deep learning**  
 [Optax](https://github.com/deepmind/optax): first-order gradient (SGD, Adam, ...) optimisers.  
diff --git a/docs/index.md b/docs/index.md
index 8987a9f7..872cec4b 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -52,6 +52,7 @@ Have a look at the [Getting Started](./usage/getting-started.md) page.
 **Always useful**  
 [Equinox](https://github.com/patrick-kidger/equinox): neural networks and everything not already in core JAX!  
 [jaxtyping](https://github.com/patrick-kidger/jaxtyping): type annotations for shape/dtype of arrays.  
+[diffraxtra](https://github.com/GalacticDynamics/diffraxtra): extras for `diffrax`; OOP and vectorization.
 
 **Deep learning**  
 [Optax](https://github.com/deepmind/optax): first-order gradient (SGD, Adam, ...) optimisers.