diff --git a/swagger/sdrangel/api/swagger/include/Structs.yaml b/swagger/sdrangel/api/swagger/include/Structs.yaml
index af17abd24..08755b94b 100644
--- a/swagger/sdrangel/api/swagger/include/Structs.yaml
+++ b/swagger/sdrangel/api/swagger/include/Structs.yaml
@@ -41,6 +41,9 @@ Range:
       type: integer
     step:
       type: integer
+    scale:
+      type: number
+      format: float
 
 RangeFloat:
   description: An arbitrary range of floating point values
@@ -66,6 +69,9 @@ FrequencyRange:
       format: int64
     step:
       type: integer
+    scale:
+      type: number
+      format: float
 
 NamedEnum:
   description: Enumeration with name for values