diff --git a/SabreTools.Helper/Data/Build.cs b/SabreTools.Helper/Data/Build.cs
index 5ab60376..c268fb05 100644
--- a/SabreTools.Helper/Data/Build.cs
+++ b/SabreTools.Helper/Data/Build.cs
@@ -143,6 +143,7 @@ Options:
 	-f=, --filename=	Set a new filename
 	-n=, --name=		Set a new internal name
 	-de=, --desc=		Set a new description
+	-r=, --root=		Set a new rootdir
 	-ca=, --category=	Set a new category
 	-v=, --version=		Set a new version
 	-da=, --date=		Set a new date
diff --git a/SabreTools.Helper/Data/Structs.cs b/SabreTools.Helper/Data/Structs.cs
index 5a37de28..ac59fdf6 100644
--- a/SabreTools.Helper/Data/Structs.cs
+++ b/SabreTools.Helper/Data/Structs.cs
@@ -83,6 +83,7 @@ namespace SabreTools.Helper
 		public string FileName;
 		public string Name;
 		public string Description;
+		public string RootDir;
 		public string Category;
 		public string Version;
 		public string Date;
diff --git a/SabreTools.Helper/Tools/DatTools.cs b/SabreTools.Helper/Tools/DatTools.cs
index b68d81e5..77bb2a03 100644
--- a/SabreTools.Helper/Tools/DatTools.cs
+++ b/SabreTools.Helper/Tools/DatTools.cs
@@ -362,6 +362,9 @@ namespace SabreTools.Helper
 							case "description":
 								datdata.Description = (String.IsNullOrEmpty(datdata.Description) ? itemval : datdata.Description);
 								break;
+							case "rootdir":
+								datdata.RootDir = (String.IsNullOrEmpty(datdata.RootDir) ? itemval : datdata.RootDir);
+								break;
 							case "category":
 								datdata.Category = (String.IsNullOrEmpty(datdata.Category) ? itemval : datdata.Category);
 								break;
@@ -773,6 +776,10 @@ namespace SabreTools.Helper
 											content = headreader.ReadElementContentAsString();
 											datdata.Description = (String.IsNullOrEmpty(datdata.Description) ? content : datdata.Description);
 											break;
+										case "rootdir":
+											content = headreader.ReadElementContentAsString();
+											datdata.RootDir = (String.IsNullOrEmpty(datdata.RootDir) ? content : datdata.RootDir);
+											break;
 										case "category":
 											content = headreader.ReadElementContentAsString();
 											datdata.Category = (String.IsNullOrEmpty(datdata.Category) ? content : datdata.Category);
diff --git a/SabreTools.Helper/Tools/Output.cs b/SabreTools.Helper/Tools/Output.cs
index 5c200cc3..8904951e 100644
--- a/SabreTools.Helper/Tools/Output.cs
+++ b/SabreTools.Helper/Tools/Output.cs
@@ -147,6 +147,7 @@ namespace SabreTools.Helper
 						header = "clrmamepro (\n" +
 							"\tname \"" + datdata.Name + "\"\n" +
 							"\tdescription \"" + datdata.Description + "\"\n" +
+							"\trootdir \"" + datdata.RootDir + "\"\n" +
 							"\tcategory \"" + datdata.Category + "\"\n" +
 							"\tversion \"" + datdata.Version + "\"\n" +
 							"\tdate \"" + datdata.Date + "\"\n" +
@@ -186,6 +187,7 @@ namespace SabreTools.Helper
 							"\t<header>\n" +
 							"\t\t<name>" + HttpUtility.HtmlEncode(datdata.Name) + "</name>\n" +
 							"\t\t<description>" + HttpUtility.HtmlEncode(datdata.Description) + "</description>\n" +
+							"\t\t<rootdir>" + HttpUtility.HtmlEncode(datdata.RootDir) + "</rootdir>\n" +
 							"\t\t<category>" + HttpUtility.HtmlEncode(datdata.Category) + "</category>\n" +
 							"\t\t<version>" + HttpUtility.HtmlEncode(datdata.Version) + "</version>\n" +
 							"\t\t<date>" + HttpUtility.HtmlEncode(datdata.Date) + "</date>\n" +
diff --git a/SabreTools/Partials/SabreTools_Inits.cs b/SabreTools/Partials/SabreTools_Inits.cs
index 0a5fbd95..6325c52a 100644
--- a/SabreTools/Partials/SabreTools_Inits.cs
+++ b/SabreTools/Partials/SabreTools_Inits.cs
@@ -79,6 +79,7 @@ namespace SabreTools
 		/// <param name="filename">New filename</param>
 		/// <param name="name">New name</param>
 		/// <param name="description">New description</param>
+		/// <param name="rootdir">New rootdir</param>
 		/// <param name="category">New category</param>
 		/// <param name="version">New version</param>
 		/// <param name="date">New date</param>
@@ -138,6 +139,7 @@ namespace SabreTools
 			string filename,
 			string name,
 			string description,
+			string rootdir,
 			string category,
 			string version,
 			string date,
@@ -287,6 +289,7 @@ namespace SabreTools
 				FileName = filename,
 				Name = name,
 				Description = description,
+				RootDir = rootdir,
 				Category = category,
 				Version = version,
 				Date = date,
diff --git a/SabreTools/SabreTools.cs b/SabreTools/SabreTools.cs
index ec1b7cfb..49c4c4c8 100644
--- a/SabreTools/SabreTools.cs
+++ b/SabreTools/SabreTools.cs
@@ -155,10 +155,11 @@ namespace SabreTools
 				repext = "",
 				romname = "",
 				romtype = "",
+				root = "",
+				rootdir = "",
 				sha1 = "",
 				sources = "",
 				systems = "",
-				root = "",
 				tempdir = "",
 				url = "",
 				version = "";
@@ -487,6 +488,10 @@ namespace SabreTools
 						{
 							prefix = temparg.Split('=')[1];
 						}
+						else if (temparg.StartsWith("-r=") || temparg.StartsWith("--root="))
+						{
+							rootdir = temparg.Split('=')[1];
+						}
 						else if (temparg.StartsWith("-rd=") || temparg.StartsWith("--root-dir="))
 						{
 							root = temparg.Split('=')[1];
@@ -640,7 +645,7 @@ namespace SabreTools
 			// Convert, update, merge, diff, and filter a DAT or folder of DATs
 			else if (update || outputCMP || outputMiss || outputRC || outputSD || outputXML || merge || diff)
 			{
-				InitUpdate(inputs, filename, name, description, category, version, date, author, email, homepage, url, comment, header,
+				InitUpdate(inputs, filename, name, description, rootdir, category, version, date, author, email, homepage, url, comment, header,
 					superdat, forcemerge, forcend, forcepack, outputCMP, outputMiss, outputRC, outputSD, outputXML, usegame, prefix,
 					postfix, quotes, repext, addext, datprefix, romba, tsv, merge, diff, cascade, inplace, bare, gamename, romname,
 					romtype, sgt, slt, seq, crc, md5, sha1, nodump, trim, single, root, outdir, clean, softlist, dedup);