diff --git a/src/rt/GEAR/rt_thermochemistry.h b/src/rt/GEAR/rt_thermochemistry.h
index 273a240e3d7ed0ec89f6e6928224ff5d25451409..40aafd2b91f7e7f7c4a9a628d93c3b354bbcc352 100644
--- a/src/rt/GEAR/rt_thermochemistry.h
+++ b/src/rt/GEAR/rt_thermochemistry.h
@@ -100,7 +100,7 @@ __attribute__((always_inline)) INLINE static void rt_tchem_first_init_part(
  * @param phys_const The physical constants in internal units.
  * @param us The internal system of units.
  * @param dt The time-step of this particle.
- * @depth recursion depth
+ * @param depth recursion depth
  */
 INLINE static void rt_do_thermochemistry(
     struct part* restrict p, struct xpart* restrict xp,