diff --git a/NEW/src/JdeScoping.DataSync/Configuration/PipelineConfig.cs b/NEW/src/JdeScoping.DataSync/Configuration/PipelineConfig.cs
index 0fa5700..fb2215e 100644
--- a/NEW/src/JdeScoping.DataSync/Configuration/PipelineConfig.cs
+++ b/NEW/src/JdeScoping.DataSync/Configuration/PipelineConfig.cs
@@ -1,7 +1,11 @@
 namespace JdeScoping.DataSync.Configuration;
 
+/// <summary>
+/// Configuration for an ETL pipeline.
+/// </summary>
 public record PipelineConfig(
     SourceConfig Source,
+    [property: Obsolete("Use Schedules property instead. SyncModes will be removed in a future version.")]
     Dictionary<string, SyncModeConfig>? SyncModes,
     PipelineSchedules? Schedules,
     List<TransformerConfig>? Transformers,
@@ -21,6 +25,10 @@ public record ParameterConfig(
     string Source = "offset",
     string? Value = null);
 
+/// <summary>
+/// Sync mode configuration (legacy format).
+/// </summary>
+[Obsolete("Use ScheduleConfig instead. SyncModeConfig will be removed in a future version.")]
 public record SyncModeConfig(
     string? MinDtOffset,
     bool PrePurge = false,
diff --git a/NEW/src/JdeScoping.DataSync/Contracts/SyncMode.cs b/NEW/src/JdeScoping.DataSync/Contracts/SyncMode.cs
index f497f07..b54d114 100644
--- a/NEW/src/JdeScoping.DataSync/Contracts/SyncMode.cs
+++ b/NEW/src/JdeScoping.DataSync/Contracts/SyncMode.cs
@@ -1,5 +1,9 @@
 namespace JdeScoping.DataSync.Contracts;
 
+/// <summary>
+/// Sync mode for ETL pipelines.
+/// </summary>
+[Obsolete("Use UpdateTypes enum and WithUpdateType() instead. SyncMode will be removed in a future version.")]
 public enum SyncMode
 {
     Mass,