diff --git a/source/blender/blenkernel/BKE_utildefines.h b/source/blender/blenkernel/BKE_utildefines.h
index 2f092d3a5a3..0eccf0cf56b 100644
--- a/source/blender/blenkernel/BKE_utildefines.h
+++ b/source/blender/blenkernel/BKE_utildefines.h
@@ -215,12 +215,21 @@ for (i=0; i<10; i++) {
 	arr[i] = something;
 }
 V_FREE(arr);
+
+arrays are buffered, using double-buffering (so on each reallocation,
+the array size is doubled).  supposedly this should give good Big Oh
+behaviour, though it may not be the best in practice.
 */
 
 #define V_DECLARE(vec) int _##vec##_count=0; void *_##vec##_tmp
+
+/*this returns the entire size of the array, including any buffering.*/
 #define V_SIZE(vec) ((vec)==NULL ? 0 : MEM_allocN_len(vec) / sizeof(*vec))
+
+/*this returns the logical size of the array, not including buffering.*/
 #define V_COUNT(vec) _##vec##_count
-#define MSTR(s) #s
+
+/*grow the array by one.  zeroes the new elements.*/
 #define V_GROW(vec) \
 	V_SIZE(vec) > _##vec##_count ? _##vec##_count++ : \
 	((_##vec##_tmp = MEM_callocN(sizeof(*vec)*(_##vec##_count*2+2), #vec " " __FILE__ " ")),\
@@ -229,8 +238,9 @@ V_FREE(arr);
 	(vec = _##vec##_tmp),\
 	_##vec##_count++)
 
-//(vec) ? WMEM_freeN(vec), 1 : 0
 #define V_FREE(vec) if (vec) MEM_freeN(vec);
+/*resets the logical size of an array to zero, but doesn't
+  free the memory.*/
 #define V_RESET(vec) _##vec##_count=0
 
 #endif
diff --git a/source/blender/bmesh/operators/subdivideop.c b/source/blender/bmesh/operators/subdivideop.c
index 70f17e20553..c94381a3f20 100644
--- a/source/blender/bmesh/operators/subdivideop.c
+++ b/source/blender/bmesh/operators/subdivideop.c
@@ -691,11 +691,14 @@ void esubdivide_exec(BMesh *bmesh, BMOperator *op)
 			j++;
 		}
 
+		for (j=0; j<face->len; j++) {
+			V_GROW(verts);
+		}
+		
 		j = 0;
 		for (nl=BMIter_New(&liter, bmesh, BM_LOOPS_OF_FACE, face);
 		     nl; nl=BMIter_Step(&liter)) {
 			b = (j-a+face->len) % face->len;
-			V_GROW(verts);
 			verts[b] = nl->v;
 			j += 1;
 		}
diff --git a/source/blender/bmesh/operators/triangulateop.c b/source/blender/bmesh/operators/triangulateop.c
index c7e36b27836..b08c633661d 100644
--- a/source/blender/bmesh/operators/triangulateop.c
+++ b/source/blender/bmesh/operators/triangulateop.c
@@ -24,10 +24,6 @@ void triangulate_exec(BMesh *bmesh, BMOperator *op)
 	for (i=0; i<finput->len; i++) {
 		face = ((BMFace**)finput->data.p)[i];
 
-		/*HACK! need to discuss with Briggs why the function takes an 
-		  externally-allocated array of vert coordinates in the first place.*/
-		//if (face->len > 400) projverts = MEM_callocN(sizeof(float)*3*face->len, "projverts");
-		//else projverts = projectverts;
 		if (lastlen < face->len) {
 			V_RESET(projectverts);
 			for (lastlen=0; lastlen<face->len; lastlen++) {