comment for TEST LastLevelCompaction

test/ttl_test.cc

@@ -105,8 +105,8 @@ TEST(TestTTL, CompactionTTL) {
 }
 
 // Time-consuming when kNumLevels is 7, so run this test when kNumLevels is set to 3,
-// the codes on branch light_ver
-// In this case level 2 is the last level with files
+// the codes on branch light_ver is a version with kNumLevels set to 3.
+// In this case level 2 is the last level with files.
 TEST(TestTTL, LastLevelCompaction) {
   DB *db;