diff --git a/EnvelopeGenerator.Web/Models/Annotation.cs b/EnvelopeGenerator.Web/Models/Annotation.cs
index fd54b68f..fef3cb10 100644
--- a/EnvelopeGenerator.Web/Models/Annotation.cs
+++ b/EnvelopeGenerator.Web/Models/Annotation.cs
@@ -101,6 +101,11 @@ public record Annotation
 
             if (_height == default && value.Height != default)
                 _height = value.Height * HeightRatio;
+
+            ClientCoefficient = value.ClientCoefficient;
         }
     }
+
+    [JsonIgnore]
+    public double ClientCoefficient { get; set; } = 1;
 };
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