diff --git a/dao/src/main/java/org/thingsboard/server/dao/timeseries/CassandraBaseTimeseriesDao.java b/dao/src/main/java/org/thingsboard/server/dao/timeseries/CassandraBaseTimeseriesDao.java
index 466068533d..736b234eb9 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/timeseries/CassandraBaseTimeseriesDao.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/timeseries/CassandraBaseTimeseriesDao.java
@@ -185,7 +185,7 @@ public class CassandraBaseTimeseriesDao extends AbstractCassandraBaseTimeseriesD
         if (isFixedPartitioning()) {
             return Futures.immediateFuture(null);
         }
-        // DO NOT apply custom to partition, otherwise, short TTL will remove partition too early
+        // DO NOT apply custom TTL to partition, otherwise, short TTL will remove partition too early
         // partitions must remain in the DB forever or be removed only by systemTtl
         // removal of empty partition is too expensive (we need to scan all data keys for these partitions with ALLOW FILTERING)
         long ttl = computeTtl(0);