diff --git a/SabreTools.Library/DatFiles/DatFile.cs b/SabreTools.Library/DatFiles/DatFile.cs
index 0ee6b444..91a0366d 100644
--- a/SabreTools.Library/DatFiles/DatFile.cs
+++ b/SabreTools.Library/DatFiles/DatFile.cs
@@ -1626,8 +1626,9 @@ namespace SabreTools.Library.DatFiles
 		/// <param name="filter">Filter object to be passed to the DatItem level</param>
 		/// <param name="splitType">Type of the split that should be performed (split, merged, fully merged)</param>
 		/// <param name="replaceMode">ReplaceMode representing what should be updated [only for base replacement]</param>
+		/// <param name="onlySame">True if descriptions should only be replaced if the game name is the same, false otherwise [only for base replacement]</param>
 		public void DetermineUpdateType(List<string> inputPaths, List<string> basePaths, string outDir, UpdateMode updateMode, bool inplace, bool skip,
-			bool bare, bool clean, bool remUnicode, bool descAsName, Filter filter, SplitType splitType, ReplaceMode replaceMode)
+			bool bare, bool clean, bool remUnicode, bool descAsName, Filter filter, SplitType splitType, ReplaceMode replaceMode, bool onlySame)
 		{
 			// Ensure we only have files in the inputs
 			List<string> inputFileNames = Utilities.GetOnlyFilesFromInputs(inputPaths, appendparent: true);
@@ -1681,7 +1682,7 @@ namespace SabreTools.Library.DatFiles
 			else if ((updateMode & UpdateMode.BaseReplace) != 0
 				|| (updateMode & UpdateMode.ReverseBaseReplace) != 0)
 			{
-				BaseReplace(inputFileNames, baseFileNames, outDir, inplace, clean, remUnicode, descAsName, filter, splitType, replaceMode);
+				BaseReplace(inputFileNames, baseFileNames, outDir, inplace, clean, remUnicode, descAsName, filter, splitType, replaceMode, onlySame);
 			}
 
 			return;
@@ -1764,8 +1765,9 @@ namespace SabreTools.Library.DatFiles
 		/// <param name="single">True if all games should be replaced by '!', false otherwise</param>
 		/// <param name="root">String representing root directory to compare against for length calculation</param>
 		/// <param name="replaceMode">ReplaceMode representing what should be updated</param>
+		/// <param name="onlySame">True if descriptions should only be replaced if the game name is the same, false otherwise</param>
 		public void BaseReplace(List<string> inputFileNames, List<string> baseFileNames, string outDir, bool inplace, bool clean, bool remUnicode,
-			bool descAsName, Filter filter, SplitType splitType, ReplaceMode replaceMode)
+			bool descAsName, Filter filter, SplitType splitType, ReplaceMode replaceMode, bool onlySame)
 		{
 			// First we want to parse all of the base DATs into the input
 			InternalStopwatch watch = new InternalStopwatch("Populating base DAT for replacement...");
@@ -1922,7 +1924,10 @@ namespace SabreTools.Library.DatFiles
 							{
 								if ((replaceMode & ReplaceMode.Description) != 0)
 								{
-									newDatItem.MachineDescription = this[key][0].MachineDescription;
+									if (!onlySame || (onlySame && newDatItem.MachineName == newDatItem.MachineDescription))
+									{
+										newDatItem.MachineDescription = this[key][0].MachineDescription;
+									}
 								}
 								if ((replaceMode & ReplaceMode.Year) != 0)
 								{
diff --git a/SabreTools/SabreTools.Help.cs b/SabreTools/SabreTools.Help.cs
index 45b6b43a..578183c1 100644
--- a/SabreTools/SabreTools.Help.cs
+++ b/SabreTools/SabreTools.Help.cs
@@ -482,6 +482,17 @@ namespace SabreTools
 					null);
 			}
 		}
+		private static Feature onlySameFlag
+		{
+			get
+			{
+				return new Feature(
+					new List<string>() { "-ons", "--only-same" },
+					"Only update description if machine name matches description",
+					FeatureType.Flag,
+					null);
+			}
+		}
 		private static Feature outputAllFlag
 		{
 			get
@@ -2261,6 +2272,7 @@ namespace SabreTools
 				update["base-replace"].AddFeature("update-names", updateNamesFlag);
 				update["base-replace"].AddFeature("update-hashes", updateHashesFlag);
 				update["base-replace"].AddFeature("update-description", updateDescriptionFlag);
+					update["base-replace"]["update-description"].AddFeature("only-same", onlySameFlag);
 				update["base-replace"].AddFeature("update-year", updateYearFlag);
 				update["base-replace"].AddFeature("update-manufacturer", updateManufacturerFlag);
 			update.AddFeature("reverse-base-replace", reverseBaseReplaceFlag);
@@ -2268,6 +2280,7 @@ namespace SabreTools
 				update["reverse-base-replace"].AddFeature("update-names", updateNamesFlag);
 				update["reverse-base-replace"].AddFeature("update-hashes", updateHashesFlag);
 				update["reverse-base-replace"].AddFeature("update-description", updateDescriptionFlag);
+					update["reverse-base-replace"]["update-description"].AddFeature("only-same", onlySameFlag);
 				update["reverse-base-replace"].AddFeature("update-year", updateYearFlag);
 				update["reverse-base-replace"].AddFeature("update-manufacturer", updateManufacturerFlag);
 			update.AddFeature("game-name", gameNameListInput);
diff --git a/SabreTools/SabreTools.Inits.cs b/SabreTools/SabreTools.Inits.cs
index 0602e087..b5f888a9 100644
--- a/SabreTools/SabreTools.Inits.cs
+++ b/SabreTools/SabreTools.Inits.cs
@@ -235,6 +235,7 @@ namespace SabreTools
 		/// <param name="remUnicode">True if we should remove non-ASCII characters from output, false otherwise (default)</param>
 		/// <param name="descAsName">True if descriptions should be used as names, false otherwise (default)</param>
 		/// <param name="replaceMode">ReplaceMode representing what should be updated [only for base replacement]</param>
+		/// <param name="onlySame">True if descriptions should only be replaced if the game name is the same, false otherwise [only for base replacement]</param>
 		private static void InitUpdate(
 			List<string> inputPaths,
 			List<string> basePaths,
@@ -257,7 +258,8 @@ namespace SabreTools
 			bool clean,
 			bool remUnicode,
 			bool descAsName,
-			ReplaceMode replaceMode)
+			ReplaceMode replaceMode,
+			bool onlySame)
 		{
 			// Normalize the extensions
 			datHeader.AddExtension = (String.IsNullOrWhiteSpace(datHeader.AddExtension) || datHeader.AddExtension.StartsWith(".")
@@ -311,7 +313,7 @@ namespace SabreTools
 			DatFile userInputDat = new DatFile(datHeader);
 			
 			userInputDat.DetermineUpdateType(inputPaths, basePaths, outDir, updateMode, inplace, skip, bare, clean,
-				remUnicode, descAsName, filter, splitType, replaceMode);
+				remUnicode, descAsName, filter, splitType, replaceMode, onlySame);
 		}
 
 		/// <summary>
diff --git a/SabreTools/SabreTools.cs b/SabreTools/SabreTools.cs
index 1f699f79..3b432984 100644
--- a/SabreTools/SabreTools.cs
+++ b/SabreTools/SabreTools.cs
@@ -88,6 +88,7 @@ namespace SabreTools
 				inverse = false,
 				noAutomaticDate = false,
 				nostore = false,
+				onlySame = false,
 				quickScan = false,
 				removeUnicode = false,
 				showBaddumpColumn = false,
@@ -311,6 +312,9 @@ namespace SabreTools
 					case "no-store-header":
 						nostore = true;
 						break;
+					case "only-same":
+						onlySame = true;
+						break;
 					case "output-all":
 						datHeader.DatFormat |= DatFormat.ALL;
 						break;
@@ -774,7 +778,7 @@ namespace SabreTools
 				case "Update":
 					VerifyInputs(inputs, feature);
 					InitUpdate(inputs, basePaths, datHeader, updateMode, inplace, skipFirstOutput, noAutomaticDate, filter,
-						splitType, outDir, cleanGameNames, removeUnicode, descAsName, replaceMode);
+						splitType, outDir, cleanGameNames, removeUnicode, descAsName, replaceMode, onlySame);
 					break;
 				// If we're using the verifier
 				case "Verify":