diff --git a/bubulles.h b/bubulles.h
index 960bee1..89e99b7 100644
--- a/bubulles.h
+++ b/bubulles.h
@@ -14,6 +14,7 @@ typedef struct {
 	unsigned long	reserved;
 	} XYZ;
 
+/* colors and transparency */
 typedef struct {
 	float		r, g, b, a;
 	unsigned long	reserved;
@@ -22,9 +23,9 @@ typedef struct {
 typedef struct {
 	XYZ		p;			/* position */
 	double  	d;			/* diameter */
-	int		gray;
+	int		gray;			/* used as an index */
 	RGBA		col;
-	long		ttl;
+	long		ttl;			/* bubulles can be aged */
 	double		kvalue;			/* wtf ? */
 	} Bubulle;
 
diff --git a/tbb.c b/tbb.c
index 97f8bfa..388ebcd 100644
--- a/tbb.c
+++ b/tbb.c
@@ -1,5 +1,5 @@
 /*
- * 	this is rudimentary test for the bubulles manages
+ * 	this is rudimentary test for the bubulles manager
  *
  * 	contact: <tth> on IRC freenode#tetalab
  */
@@ -119,15 +119,14 @@ int		foo;
 printf("*** Bubulles Testing -- %s %s\n\n", __DATE__, __TIME__);
 
 bubulles_version(1);
+print_sizeof();
 
 test_alloc_free(5);
 test_push_pop(2000);
 test_cleanfill_my_bublist(999);
 
-/*
 foo = test_peek_poke(5000);
 fprintf(stderr, "test peek/poke -> %d\n", foo);
-*/
 
 return 0;
 }