diff --git a/README.md b/README.md
index d6a205c..862f4cd 100644
--- a/README.md
+++ b/README.md
@@ -52,13 +52,12 @@ See [EXAMPLES.md](./EXAMPLES.md)
 * `-c`: read data as CSVs
 * `-C`: output data with a CSV format
 * `-s`: treat numbers from input data as strings
-* `-i`: separators change input field separators
-* `-I`: separators change input field separators with a regular expression
-* `-m`: modules import modules
-* `-o`: separators change output field separators
-* `-v`: `<variable>=<string>` define a variable from a string on the shell
-* `-j`: json mode (A json tree is stored in the dictonary `D`.)
-* `-y`: yaml mode (A json tree is stored in the dictonary `D`.)
+* `-i <separator>`: separators change input field separators
+* `-I <separator>`: separators change input field separators with a regular expression
+* `-m <module>`: modules import modules
+* `-o <separator>`: separators change output field separators
+* `-v <variable>=<string>`: define a variable from a string on the shell
+* `-t <json/yaml/xml>`: tree mode (A json/yaml/xml file is loaded to an object "T".)
 * `--help`: show help
 
 
diff --git a/opy.1 b/opy.1
index 4ee7ea8..f5cdbb9 100644
--- a/opy.1
+++ b/opy.1
@@ -74,11 +74,8 @@ change output field separators
 .I <variable>=<string>
 define a variable from a string on the shell
 .TP
-.B \-j
-json mode. Opy reads a json tree from a file and it is stored to a dictonary D.
-.TP
-.B \-y
-yaml mode. Opy reads a yaml tree from a file and it is stored to a dictonary D.
+.B \-t <json|yaml|xml>
+tree mode. Opy reads a tree from a file and it is stored to an object T.
 
 .SH SEE ALSO
 .BR python3 (1)