diff --git a/StayWell.Interface/bin/Debug/StayWell.Interface.dll b/StayWell.Interface/bin/Debug/StayWell.Interface.dll
index 22b5b01..74ec880 100644
Binary files a/StayWell.Interface/bin/Debug/StayWell.Interface.dll and b/StayWell.Interface/bin/Debug/StayWell.Interface.dll differ
diff --git a/StayWell.Interface/bin/Debug/StayWell.Interface.pdb b/StayWell.Interface/bin/Debug/StayWell.Interface.pdb
index 3870113..8ca7d35 100644
Binary files a/StayWell.Interface/bin/Debug/StayWell.Interface.pdb and b/StayWell.Interface/bin/Debug/StayWell.Interface.pdb differ
diff --git a/StayWell.ServiceDefinitions/Content/Objects/ContentModificationItem.cs b/StayWell.ServiceDefinitions/Content/Objects/ContentModificationItem.cs
new file mode 100644
index 0000000..ed97f1f
--- /dev/null
+++ b/StayWell.ServiceDefinitions/Content/Objects/ContentModificationItem.cs
@@ -0,0 +1,16 @@
+namespace StayWell.ServiceDefinitions.Content.Objects {
+	/// <summary>
+	/// Reference used for added, updated, or deleted content
+	/// </summary>
+	public class ContentModificationItem {
+		/// <summary>
+		/// Content slug
+		/// </summary>
+		public string ContentSlug { get; set; }
+
+		/// <summary>
+		/// Bucket slug
+		/// </summary>
+		public string BucketSlug { get; set; }
+	}
+}
diff --git a/StayWell.ServiceDefinitions/Content/Objects/ContentModifications.cs b/StayWell.ServiceDefinitions/Content/Objects/ContentModifications.cs
new file mode 100644
index 0000000..a9ab35f
--- /dev/null
+++ b/StayWell.ServiceDefinitions/Content/Objects/ContentModifications.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Xml.Serialization;
+
+namespace StayWell.ServiceDefinitions.Content.Objects {
+	/// <summary>
+	/// List of added, updated, or deleted content
+	/// </summary>
+	[XmlType("ModifiedContentResponse")]
+	public class ContentModifications {
+		/// <summary>
+		/// Requested start time to return modifications from.
+		/// </summary>
+		public DateTime StartTime { get; set; }
+
+		/// <summary>
+		/// List of content items that have been added
+		/// </summary>
+		public List<ContentModificationItem> Additions { get; set; }
+
+		/// <summary>
+		/// List of content items that have been removed
+		/// </summary>
+		public List<ContentModificationItem> Removals { get; set; }
+
+		/// <summary>
+		/// List of content items that have been updated
+		/// </summary>
+		public List<ContentModificationItem> Updates { get; set; }
+	}
+}
diff --git a/StayWell.ServiceDefinitions/StayWell.ServiceDefinitions.csproj b/StayWell.ServiceDefinitions/StayWell.ServiceDefinitions.csproj
index d7e34b3..070debb 100644
--- a/StayWell.ServiceDefinitions/StayWell.ServiceDefinitions.csproj
+++ b/StayWell.ServiceDefinitions/StayWell.ServiceDefinitions.csproj
@@ -105,6 +105,8 @@
     <Compile Include="Content\Objects\ContentHistoryResponse.cs" />
     <Compile Include="Content\Objects\ContentList.cs" />
     <Compile Include="Content\Objects\ContentMetadataResponse.cs" />
+    <Compile Include="Content\Objects\ContentModificationItem.cs" />
+    <Compile Include="Content\Objects\ContentModifications.cs" />
     <Compile Include="Content\Objects\ContentOriginType.cs" />
     <Compile Include="Content\Objects\ContentRatingResponse.cs" />
     <Compile Include="Content\Objects\ContentResponse.cs" />