diff --git a/Proteomics/RetentionTimePrediction/SeparationType.cs b/Proteomics/RetentionTimePrediction/SeparationType.cs
new file mode 100644
index 000000000..de2f89971
--- /dev/null
+++ b/Proteomics/RetentionTimePrediction/SeparationType.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Proteomics.RetentionTimePrediction
+{
+    public enum SeparationType
+    {
+        HPLC, //this is for all reverse phase separations at this time
+        CZE //this is for capillary electrophoresis separations
+    }
+}