diff --git a/DATabase/DATabase.cs b/DATabase/DATabase.cs
index 931f433a..198908e8 100644
--- a/DATabase/DATabase.cs
+++ b/DATabase/DATabase.cs
@@ -430,7 +430,7 @@ namespace SabreTools
 			}
 
 			// Merge, diff, and dedupe at least 2 DATs
-			else if (merge)
+			else if (merge || diff)
 			{
 				InitMergeDiff(inputs, name, desc, cat, version, author, ad, diff, dedup, bare, forceunpack, old);
 			}
diff --git a/SabreHelper/Build.cs b/SabreHelper/Build.cs
index fc297fad..e07ebc2e 100644
--- a/SabreHelper/Build.cs
+++ b/SabreHelper/Build.cs
@@ -118,7 +118,7 @@ Options:
   -lsy, --list-systems	List all systems (id <= name)
   -m, --merge		Merge one or more DATs
 	-ad, --all-diff	Enable output of all diff variants
-	-di, --diff		Switch to diffdat mode
+	-di, --diff		Switch to diffdat mode (merge flag not required)
 	-dd, --dedup		Enable deduping in the created DAT
 	-b, --bare		Don't include date in file name
 	-u, --unzip		Force unzipping in created DAT