diff --git a/src/const.h b/src/const.h
index c004e4e2e6438d578c63fef04486dbee2c418eb1..f7cf6113364f321d8f45960c4fcb50723b124c11 100644
--- a/src/const.h
+++ b/src/const.h
@@ -39,10 +39,6 @@
 /* Time integration constants. */
 #define const_max_u_change 0.1f
 
-/* Gravity stuff. */
-#define multipole_order 2
-#define const_gravity_eta 0.025f
-
 /* Kernel function to use */
 #define CUBIC_SPLINE_KERNEL
 //#define QUARTIC_SPLINE_KERNEL
@@ -56,7 +52,11 @@
 #define GADGET2_SPH
 //#define DEFAULT_SPH
 
-/* Gravity properties */
+/* Self gravity stuff. */
+#define multipole_order 2
+#define const_gravity_eta 0.025f
+
+/* External gravity properties */
 #define EXTERNAL_POTENTIAL_POINTMASS
 
 //#define SANITY_CHECKS