diff --git a/SSZipArchive/SSZipArchive.h b/SSZipArchive/SSZipArchive.h
index 4bba494..2f8b333 100644
--- a/SSZipArchive/SSZipArchive.h
+++ b/SSZipArchive/SSZipArchive.h
@@ -20,24 +20,31 @@
 + (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination;
 + (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination delegate:(id<SSZipArchiveDelegate>)delegate;
 
-+ (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination overwrite:(BOOL)overwrite password:(NSString *)password error:(NSError **)error;
-+ (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination overwrite:(BOOL)overwrite password:(NSString *)password error:(NSError **)error delegate:(id<SSZipArchiveDelegate>)delegate;
++ (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination overwrite:(BOOL)overwrite password:(NSString *)password error:(NSError * *)error;
++ (BOOL)unzipFileAtPath:(NSString *)path toDestination:(NSString *)destination overwrite:(BOOL)overwrite password:(NSString *)password error:(NSError * *)error delegate:(id<SSZipArchiveDelegate>)delegate;
 
 + (BOOL)unzipFileAtPath:(NSString *)path
-		  toDestination:(NSString *)destination
-		progressHandler:(void (^)(NSString *entry, unz_file_info zipInfo, long entryNumber, long total))progressHandler
-	  completionHandler:(void (^)(NSString *path, BOOL succeeded, NSError *error))completionHandler;
+    toDestination:(NSString *)destination
+    progressHandler:(void (^)(NSString *entry, unz_file_info zipInfo, long entryNumber, long total))progressHandler
+    completionHandler:(void (^)(NSString *path, BOOL succeeded, NSError *error))completionHandler;
 
 + (BOOL)unzipFileAtPath:(NSString *)path
-		  toDestination:(NSString *)destination
-			  overwrite:(BOOL)overwrite
-			   password:(NSString *)password
-		progressHandler:(void (^)(NSString *entry, unz_file_info zipInfo, long entryNumber, long total))progressHandler
-	  completionHandler:(void (^)(NSString *path, BOOL succeeded, NSError *error))completionHandler;
+    toDestination:(NSString *)destination
+    overwrite:(BOOL)overwrite
+    password:(NSString *)password
+    progressHandler:(void (^)(NSString *entry, unz_file_info zipInfo, long entryNumber, long total))progressHandler
+    completionHandler:(void (^)(NSString *path, BOOL succeeded, NSError *error))completionHandler;
 
-// Zip, password could be nil
+// Zip
+
+// without password
++ (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)paths;
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath;
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath keepParentDirectory:(BOOL)keepParentDirector;
+
+// with password, password could be nil
 + (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)paths withPassword:(NSString *)password;
-+ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath  withPassword:(NSString *)password;
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath withPassword:(NSString *)password;
 + (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath keepParentDirectory:(BOOL)keepParentDirectory withPassword:(NSString *)password;
 
 - (instancetype)initWithPath:(NSString *)path;
diff --git a/SSZipArchive/SSZipArchive.m b/SSZipArchive/SSZipArchive.m
index 296461f..c7a8f45 100644
--- a/SSZipArchive/SSZipArchive.m
+++ b/SSZipArchive/SSZipArchive.m
@@ -374,6 +374,17 @@
 }
 
 #pragma mark - Zipping
++ (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)paths
+{
+    return [SSZipArchive createZipFileAtPath:path withFilesAtPaths:paths withPassword:nil];
+}
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath{
+    return [SSZipArchive createZipFileAtPath:path withContentsOfDirectory:directoryPath withPassword:nil];
+}
+
++ (BOOL)createZipFileAtPath:(NSString *)path withContentsOfDirectory:(NSString *)directoryPath keepParentDirectory:(BOOL)keepParentDirector{
+    return [SSZipArchive createZipFileAtPath:path withContentsOfDirectory:directoryPath keepParentDirectory:keepParentDirector withPassword:nil];
+}
 
 + (BOOL)createZipFileAtPath:(NSString *)path withFilesAtPaths:(NSArray *)paths withPassword:(NSString *)password
 {