diff --git a/radiation.c b/radiation.c
index 1a1631f31..64e02b562 100755
--- a/radiation.c
+++ b/radiation.c
@@ -166,13 +166,15 @@ radiation (p, ds)
   freq = 0.5 * (freq_inner + freq_outer);
 
 
-  
+
+  /* calculate free-free, compton and ind-compton opacities 
+     note that we also call these with the average frequency along ds */
 
   kappa_tot = frac_ff = kappa_ff (xplasma, freq);	/* Add ff opacity */
   kappa_tot += frac_comp = kappa_comp (xplasma, freq);	/* 70 NSH 1108 calculate compton opacity, store it in kappa_comp and also add it to kappa_tot, the total opacity for the photon path */
   kappa_tot += frac_ind_comp = kappa_ind_comp (xplasma, freq);
   frac_tot = frac_z = 0;	/* 59a - ksl - Moved this line out of loop to avoid warning, but notes 
-				   indicate this is all disagnostic and might be removed */
+				                           indicate this is all disagnostic and might be removed */
 
 
   if (freq > phot_freq_min)
diff --git a/version.h b/version.h
index 261f331a3..ab3c3210d 100755
--- a/version.h
+++ b/version.h
@@ -1,2 +1,2 @@
-#define VERSION  "ff"
+#define VERSION  "77a_dev"
 #define CHOICE 1 // Compress plasma as much as possible