diff --git a/src/hydro/Gadget2/hydro_part.h b/src/hydro/Gadget2/hydro_part.h
index 0c14da957463720dcee5349e88be91986cbb3f54..4bbbf0aede12b692b15442b71a03ffbbcf2f8378 100644
--- a/src/hydro/Gadget2/hydro_part.h
+++ b/src/hydro/Gadget2/hydro_part.h
@@ -109,7 +109,7 @@ struct part {
       /*! "Grad h" term */
       float f;
 
-      /* Pressure over density squared (including drho/dh term) */
+      /* Pressure over density squared  */
       float P_over_rho2;
 
       /* Particle sound speed. */