diff --git a/README.md b/README.md
index b53bef5..16cf400 100644
--- a/README.md
+++ b/README.md
@@ -1,16 +1,30 @@
-# supGecko
-A helper library to write Gecko code
+# supSMSGecko
+A tool to make Gecko codes for Super Mario Sunshine.
 
 ## Installation
 ```
-pip install supGecko
+pip install supSMSGecko
 ```
 
-## Usage
+## Example
 ```python
-from supGecko import Gecko
+from supSMSGecko import make_xml, symbols, Button as B
 
-g = Gecko()
-# TODO: usage of the Gecko class
-print(g.dump_txt())
+def main(g, ver):
+  S = symbols[ver]
+  addr_inst = 0x26 + S['TMarDirector::direct']
+  addr_input = S['mPadStatus']
+  # code
+  g.write16(addr_inst, 600)
+  g.if16(addr_input, '==', B.B | B.DL)
+  g.write16(addr_inst, 2400)
+  g.if16(addr_input, '==', B.B | B.DR, endif=True)
+  g.write16(addr_inst, 4800)
+  g.endif()
+
+# output the generated Gecko codes for all 4 versions to "@code.xml"
+make_xml(main)
 ```
+
+## TODO
+- [ ] document of each function