diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/db/entity/Gas.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/db/entity/Gas.kt
index a790613..0eae66b 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/db/entity/Gas.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/db/entity/Gas.kt
@@ -13,4 +13,5 @@ data class Gas(
     @ColumnInfo(name = "unit") val unit: String,
     @ColumnInfo(name = "threshold_low") val thresholdLow: Double,
     @ColumnInfo(name = "threshold_high") val thresholdHigh: Double,
+    @ColumnInfo(name = "sync_flag") val syncFlag: Boolean = false
 )