diff --git a/swagger/sdrangel/api/swagger/include/FreqTracker.yaml b/swagger/sdrangel/api/swagger/include/FreqTracker.yaml
index 68a029cd5..5d507b162 100644
--- a/swagger/sdrangel/api/swagger/include/FreqTracker.yaml
+++ b/swagger/sdrangel/api/swagger/include/FreqTracker.yaml
@@ -19,6 +19,8 @@ FreqTrackerSettings:
       type: integer
     title:
       type: string
+    spanLog2:
+      type: integer
     alphaEMA:
       description: Alpha factor for delta frequency EMA
       type: number