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diff --git a/Classes/HJMOBigFileCache.h b/Classes/HJMOBigFileCache.h
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+++ b/Classes/HJMOBigFileCache.h
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+//
+//  HJMOBigFileCache.h
+//  hjlib
+//
+//  Copyright Hunter and Johnson 2009, 2010, 2011
+//  HJCache may be used freely in any iOS or Mac application free or commercial.
+//  May be redistributed as source code only if all the original files are included.
+//  See http://www.markj.net/hjcache-iphone-image-cache/
+
+#import <Foundation/Foundation.h>
+#import "HJMOFileCache.h"
+
+/*
+ HJBigFileCache is more scalable for very large caches. When the cache gets very
+ large, then the trim time gets big because trimming the size of the cache requires
+ scanning through all of its files and checking their age and size. HJBigFileCache
+ divides that probem into 10 by trimming 1/10th of the cache each day in a 10 day cycle.
+ */
+
+@interface HJMOBigFileCache : HJMOFileCache {
+
+	NSNumber* lastTrimDirNum;
+	NSDate* lastTrimDate;
+}
+
+@property (retain) NSNumber* lastTrimDirNum;
+@property (retain) NSDate* lastTrimDate;
+
+@end