diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 452513b..b6d38b1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2517,7 +2517,10 @@
 	zone->free_area[order].nr_free--;
 	rmv_page_order(page);
 
-	/* Set the pageblock if the isolated page is at least a pageblock */
+	/*
+	 * Set the pageblock if the isolated page is at least half of a
+	 * pageblock
+	 */
 	if (order >= pageblock_order - 1) {
 		struct page *endpage = page + (1 << order) - 1;
 		for (; page < endpage; page += pageblock_nr_pages) {