diff --git a/loadubjson.m b/loadubjson.m
index b637b29..20a2f07 100644
--- a/loadubjson.m
+++ b/loadubjson.m
@@ -31,10 +31,6 @@
 %                         the "name" tag is treated as a string. To load 
 %                         these UBJSON data, you need to manually set this 
 %                         flag to 1.
-%           opt.Compression  'zlib' or 'gzip': specify array compression
-%                         method; currently only support 'gzip' or 'zlib'.
-%           opt.CompressArraySize [0|int]: only compress arrays with a total 
-%                         element count larger than this number.
 %
 % output:
 %      dat: a cell array, where {...} blocks are converted into cell arrays,
diff --git a/savejson.m b/savejson.m
index 650f3db..0519cdd 100644
--- a/savejson.m
+++ b/savejson.m
@@ -69,7 +69,7 @@
 %        opt.Compact [0|1]: 1- out compact JSON format (remove all newlines and tabs)
 %        opt.Compression  'zlib' or 'gzip': specify array compression
 %                         method; currently only support 'gzip' or 'zlib'.
-%        opt.CompressArraySize [0|int]: only compress arrays with a total 
+%        opt.CompressArraySize [100|int]: only compress arrays with a total 
 %                         element count larger than this number.
 %        opt can be replaced by a list of ('param',value) pairs. The param 
 %        string is equivallent to a field in opt and is case sensitive.
@@ -389,7 +389,7 @@
 sep=ws.sep;
 
 dozip=jsonopt('Compression','',varargin{:});
-zipsize=jsonopt('CompressArraySize',0,varargin{:});
+zipsize=jsonopt('CompressArraySize',100,varargin{:});
 
 if(length(size(item))>2 || issparse(item) || ~isreal(item) || ...
    (isempty(item) && any(size(item))) ||jsonopt('ArrayToStruct',0,varargin{:}) || (~isempty(dozip) && numel(item)>zipsize))
diff --git a/saveubjson.m b/saveubjson.m
index a5462be..6b4dac0 100644
--- a/saveubjson.m
+++ b/saveubjson.m
@@ -55,6 +55,10 @@
 %                         wrapped inside a function call as 'foo(...);'
 %        opt.UnpackHex [1|0]: conver the 0x[hex code] output by loadjson 
 %                         back to the string form
+%        opt.Compression  'zlib' or 'gzip': specify array compression
+%                         method; currently only support 'gzip' or 'zlib'.
+%        opt.CompressArraySize [100|int]: only compress arrays with a total 
+%                         element count larger than this number.
 %
 %        opt can be replaced by a list of ('param',value) pairs. The param 
 %        string is equivallent to a field in opt and is case sensitive.
@@ -294,7 +298,7 @@
 end
 
 dozip=jsonopt('Compression','',varargin{:});
-zipsize=jsonopt('CompressArraySize',0,varargin{:});
+zipsize=jsonopt('CompressArraySize',100,varargin{:});
 
 if(length(size(item))>2 || issparse(item) || ~isreal(item) || ...
    (isempty(item) && any(size(item))) ||jsonopt('ArrayToStruct',0,varargin{:}) || (~isempty(dozip) && numel(item)>zipsize))