diff --git a/src/common/inc/tdataformat.h b/src/common/inc/tdataformat.h
index 8a09ea4862763b0b444aced6a84255f418290bb9..ed5ebaa80f590c993a03f7529561d4b9244a6b42 100644
--- a/src/common/inc/tdataformat.h
+++ b/src/common/inc/tdataformat.h
@@ -68,9 +68,9 @@ typedef struct {
 typedef struct {
   int      version;    // version
   int      numOfCols;  // Number of columns appended
-  int      tlen;       // maximum length of a SDataRow without the header part
+  int      tlen;       // maximum length of a SDataRow without the header part (sizeof(VarDataOffsetT) + sizeof(VarDataLenT) + (bytes))
   uint16_t flen;       // First part length in a SDataRow after the header part
-  uint16_t vlen;       // pure value part length, excluded the overhead
+  uint16_t vlen;       // pure value part length, excluded the overhead (bytes only)
   STColumn columns[];
 } STSchema;
 
diff --git a/src/tsdb/src/tsdbCommitQueue.c b/src/tsdb/src/tsdbCommitQueue.c
index f388e2cee612b09089a6d75caaeceef105351ca1..9e8e4acd7ebea2209bf08798eb80f300a72927ab 100644
--- a/src/tsdb/src/tsdbCommitQueue.c
+++ b/src/tsdb/src/tsdbCommitQueue.c
@@ -31,7 +31,7 @@ typedef struct {
 
 static void *tsdbLoopCommit(void *arg);
 
-SCommitQueue tsCommitQueue = {0};
+static SCommitQueue tsCommitQueue = {0};
 
 int tsdbInitCommitQueue() {
   int nthreads = tsNumOfCommitThreads;