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diff --git a/Sparkle.framework/Versions/A/Headers/SUVersionComparisonProtocol.h b/Sparkle.framework/Versions/A/Headers/SUVersionComparisonProtocol.h
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+++ b/Sparkle.framework/Versions/A/Headers/SUVersionComparisonProtocol.h
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+//
+//  SUVersionComparisonProtocol.h
+//  Sparkle
+//
+//  Created by Andy Matuschak on 12/21/07.
+//  Copyright 2007 Andy Matuschak. All rights reserved.
+//
+
+#ifndef SUVERSIONCOMPARISONPROTOCOL_H
+#define SUVERSIONCOMPARISONPROTOCOL_H
+
+#import <Cocoa/Cocoa.h>
+
+/*!
+    Provides version comparison facilities for Sparkle.
+*/
+@protocol SUVersionComparison
+
+/*!
+    An abstract method to compare two version strings.
+
+    Should return NSOrderedAscending if b > a, NSOrderedDescending if b < a,
+    and NSOrderedSame if they are equivalent.
+*/
+- (NSComparisonResult)compareVersion:(NSString *)versionA toVersion:(NSString *)versionB; // *** MAY BE CALLED ON NON-MAIN THREAD!
+
+@end
+
+#endif