diff --git a/DiffDat/DiffDat.cs b/DiffDat/DiffDat.cs
index 9e57aa0f..54d1f4e2 100644
--- a/DiffDat/DiffDat.cs
+++ b/DiffDat/DiffDat.cs
@@ -34,7 +34,7 @@ namespace SabreTools
 			Build.Start("DiffDat");
 
 			List<String> inputs = new List<String>();
-			bool tofile = false, help = false;
+			bool tofile = false, help = false, merge = false; ;
 			foreach (string arg in args)
 			{
 				switch (arg)
@@ -48,6 +48,10 @@ namespace SabreTools
 					case "--log":
 						tofile = true;
 						break;
+					case "-m":
+					case "--merge":
+						merge = true;
+						break;
 					default:
 						// Add actual files to the list of inputs
 						if (File.Exists(arg.Replace("\"", "")))
@@ -84,6 +88,13 @@ namespace SabreTools
 				List<RomData> B = RomManipulation.Parse(input, 0, 0, logger);
 				A = RomManipulation.Diff(A, B);
 			}
+
+			// If we want a merged list, send it for merging before outputting
+			if (merge)
+			{
+				A = RomManipulation.Merge(A);
+			}
+
 			Output.WriteToDat("diffdat", "diffdat", "", "", "DiffDat", "SabreTools", false, !RomManipulation.IsXmlDat(inputs[0]), "", A, logger);
 		}
 	}
diff --git a/README.MD b/README.MD
index f387b676..93ee1400 100644
--- a/README.MD
+++ b/README.MD
@@ -71,9 +71,9 @@ Experimental tool for trimming all files in DAT (or folder of DATs) so that they
 <p/>
 A program to create a DAT based on the differences between two or more input DATs.
 <ul>
-	<li>Intended for use with DATs in the same "family", e.g. a DAT and a fixdat generated from it or two different fixdats</li>
 	<li>Read in from commandline, drag-and-drop, a directory, or any combination</li>
 	<li>Output type automatically determined by the first input file</li>
+	<li>Merge the output DAT so no partial duplicates are included</li>
 </ul>
 
 <b>DatToMiss</b>
diff --git a/SabreHelper/Build.cs b/SabreHelper/Build.cs
index e1084772..38353c47 100644
--- a/SabreHelper/Build.cs
+++ b/SabreHelper/Build.cs
@@ -163,7 +163,8 @@ Usage: DiffDat [options] [filename] [filename] ...
 
 Options:
   -h, -?, --help	Show this help dialog
-  -l, --log		Enable log to file");
+  -l, --log		Enable log to file
+  -m, --merge	Enable merging in the created DAT");
 					break;
 				default:
 					Console.Write("This is the default help output");