diff --git a/DocumentOperator.Domain/Models/ValueObjects/AnnotationOrigin.cs b/DocumentOperator.Domain/Models/ValueObjects/AnnotationOrigin.cs
new file mode 100644
index 0000000..3ed0773
--- /dev/null
+++ b/DocumentOperator.Domain/Models/ValueObjects/AnnotationOrigin.cs
@@ -0,0 +1,18 @@
+namespace DocumentOperator.Domain.Models.ValueObjects;
+
+/// <summary>
+/// Coordinate origin point for PDF annotations.
+/// PDF default is BottomLeft, but users may prefer TopLeft for easier UI integration.
+/// </summary>
+public enum AnnotationOrigin
+{
+    /// <summary>
+    /// Bottom-left corner (PDF native coordinate system, default)
+    /// </summary>
+    BottomLeft,
+    
+    /// <summary>
+    /// Top-left corner (common in UI frameworks)
+    /// </summary>
+    TopLeft
+}