diff --git a/src/models/Scan.ts b/src/models/Scan.ts
index 3fd64ed..5e8cbf9 100644
--- a/src/models/Scan.ts
+++ b/src/models/Scan.ts
@@ -35,11 +35,19 @@ export abstract class Scan {
   @IsPositive()
   abstract distance: number;
 
-    /**
-   * Is the scan valid (for fraud reasons).
-   * Default: true
-   */
+  /**
+ * Is the scan valid (for fraud reasons).
+ * Default: true
+ */
   @Column()
   @IsBoolean()
   valid: boolean = true;
+
+  /**
+   * seconds since last scan
+   */
+  @IsInt()
+  @IsOptional()
+  secondsSinceLastScan: number;
+
 }