diff --git a/diffrax/brownian/tree.py b/diffrax/brownian/tree.py
index 844676bd..dc09c1e0 100644
--- a/diffrax/brownian/tree.py
+++ b/diffrax/brownian/tree.py
@@ -269,7 +269,7 @@ def _brownian_arch(
             - `bhh_st_tu`: (optional) $(\bar{H}_{s,t}, \bar{H}_{t,u})$
             - `bkk_t`: (optional) $(\bar{K}_s, \bar{K}_t, \bar{K}_u)$
             - `bkk_st_tu`: (optional) $(\bar{K}_{s,t}, \bar{K}_{t,u})$
-            
+
         """
 
         su = jnp.power(jnp.asarray(2.0, dtype), -level)