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+++ b/README.md
@@ -1,2 +1,39 @@
-# i18n_au3
+# i18n AU3
 Transliteration library for AutoIt
+
+How to use
+----------
+
+When translating, you have two options: the first one is to use a global file on the following format:
+
+```
+[language_code]
+text_id=Translation
+text_with_format=Number: %.2f
+text_with_parameter=Hi %s
+
+[another_language_code]
+text_id=Tradução
+...
+```
+
+The second option is to separate every translation into files named `language_code.lng` in a folder of your choice. Note that every file on this folder will have the following format:
+
+```
+[language_code]
+text_id=Translation
+text_with_format=Number: %.2f
+text_with_parameter=Hi %s
+```
+
+The language code can be ISO 639-1 (2 chars, like "en", "pt", "es") or culture code (including the country, like "en-US", "pt-BR", "es-ES"). You can use both these formats on the same file/project without any problem.
+
+Finally, use the `_()` function to get your translation text. It accepts the following syntax:
+
+```
+_($sText_id [, $sPar1 [, $sParn ] ] )
+```
+
+The parameters are optional, but the maximum number of parameters is 32. If you need more than 32 parameters (sure?), please consider splitting your string into multiple ones.
+
+Note that everything is explained on the example. See (Example.au3)[Example.au3] and (Example.ini)[Example.ini].