diff --git a/tools/testing/selftests/mm/va_high_addr_switch.c b/tools/testing/selftests/mm/va_high_addr_switch.c
index 6679213effed..7cfaf4a74c57 100644
--- a/tools/testing/selftests/mm/va_high_addr_switch.c
+++ b/tools/testing/selftests/mm/va_high_addr_switch.c
@@ -30,8 +30,8 @@
 #endif
 
 /*
- * >= 128TB is the hint addr value we used to select
- * large address space.
+ * The hint addr value is used to allocate addresses
+ * beyond the high address switch boundary.
  */
 
 #define ADDR_MARK_128TB	(1UL << 47)
@@ -73,9 +73,10 @@ static struct testcase testcases[] = {
 	},
 	{
 		/*
-		 * We should never allocate at the requested address or above it
-		 * The len cross the 128TB boundary. Without MAP_FIXED
-		 * we will always search in the lower address space.
+		 * Unless MAP_FIXED is specified, allocation based on hint
+		 * addr is never at requested address or above it, which is
+		 * beyond high address switch boundary in this case. Instead,
+		 * a suitable allocation is found in lower address space.
 		 */
 		.addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
 		.size = 2 * PAGE_SIZE,
@@ -85,8 +86,8 @@ static struct testcase testcases[] = {
 	},
 	{
 		/*
-		 * Exact mapping at 128TB, the area is free we should get that
-		 * even without MAP_FIXED.
+		 * Exact mapping at high address switch boundary, should
+		 * be obtained even without MAP_FIXED as area is free.
 		 */
 		.addr = ((void *)(ADDR_SWITCH_HINT)),
 		.size = PAGE_SIZE,