doc change

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diff --git a/doc/nerv_io.md b/doc/nerv_io.md
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index 0000000..7066939
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+++ b/doc/nerv_io.md
@@ -0,0 +1,23 @@
+#The Nerv IO Package#
+Part of the [Nerv](../README.md) toolkit.
+
+##Description##
+There are four classes in to deal with chunk data, which are __nerv.ChunkFile__, __nerv.ChunkFileHandle__, __nerv.ChunkInfo__, __nerv.ChunkData__. Below is the underlying C structs.
+```
+typedef struct ChunkFileHandle {
+    FILE *fp;
+} ChunkFileHandle;
+
+typedef struct ChunkInfo {
+    off_t offset, length;
+} ChunkInfo;
+
+typedef struct ChunkData {
+    FILE *fp;
+    char *data;
+} ChunkData;
+```
+
+##Methods##
+* __ChunkFileHandle ChunkFile.\_\_init(string mode, string fn)__  
+`mode` can be `r` or `w`, for reading or writing a file.
diff --git a/doc/nerv_matrix.md b/doc/nerv_matrix.md
index 1a2778b..22971d2 100644
--- a/doc/nerv_matrix.md
+++ b/doc/nerv_matrix.md
@@ -102,6 +102,12 @@ Return a new __MMatrix__ which is a copy of `self`.
 * __string Matrix.\_\_tostring\_\_(Matrix self)__  
 Returns a string containing values of __Matrix__ `self`.
 ---
+* __MMatrix MMatrix.load(ChunkData chunk)__  
+Return a new __MMatrix__ loaded from the file position in `chunk`.
+* __void MMatrix.save(MMatrix self, ChunkFileHandle chunk)__  
+Write `self` to the file position in `chunk`.
+* __void MMatrix.copy_from(MMatrix ma, MMatrix mb,[int b_bgein, int b_end, int a_begin])__  
+Copy a part of `mb`(rows of index `[b_begin..b_end)`) to `ma` beginning at row index `a_begin`. If not specified, `b_begin` will be `0`, `b_end` will be `b.nrow`, `a_begin` will be `0`.
 
 ##Examples##
 * Use `get_dataref_value` to test __Nerv__'s matrix space allocation.  
diff --git a/doc/nerv_param.md b/doc/nerv_param.md
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+++ b/doc/nerv_param.md
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+#The Nerv Parameter Package#
+Part of the [Nerv](../README.md) toolkit.
+
+##Description##
+###Class hierarchy###
+There is a base class __Nerv.Param__ defined in `layer/init.lua`.  
+__Nerv.MatrixParam__ inherits __Nerv.Param__.  
+__Nerv.LinearTransParam__, __Nerv.BiasParam__ inherits __Nerv.MatrixParam__.  
+###Class member###
+* __Nerv.MatrixParam__
+	* __nerv.CuMatrix__ trans
+	Stores the parameter matrix.
+
+##Methods##
+* __void Param.\_\_init(Param self, string id, table global_conf)__  
+Constructor of a __Param__, it will set `self.id` to be `id` and `self.gconf` to be `global_conf`.
+* __void Param.set_info(table info)__  
+Set `self.info` to be `info`.
+* __table Param.get_info()__  
+Returns `self.info`.
+* __void Param.read(ChunkData pcdata)__  
+This is not implemented in `nerv.Param`.
+* __void MatrixParam.read(MatrixParam self, ChunkData pcdata)__  
+Read `self.trans` from `pcdata`.
+* __void MatrixParam.write(MatrixParam self, ChunkFileHandle pfhandle)__  
+Write `self.trans` to `pfhandle`.
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