diff --git a/readme.md b/readme.md
index 819ac63..606f46c 100644
--- a/readme.md
+++ b/readme.md
@@ -1,3 +1,26 @@
 # TCI Translation Library
 
 Translate the TCI interface from CSV translation files.
+
+## Example
+
+TCI-i18n provides translation from CSV files.
+
+### CSV files format
+
+CSV files can have this format and should be UTF-8 encoded
+
+```
+TCI title,Titre ITC
+"yes, or no","oui, ou non"
+Welcome %(user)s!,Bienvenue %(user)s !
+```
+
+### Usage
+
+```
+from tcii18n import Translator
+
+translator = Translator('my_file.csv')
+translator.translate('My string')
+```
diff --git a/tcii18n/template.py b/tcii18n/template.py
index ff5030c..2475314 100644
--- a/tcii18n/template.py
+++ b/tcii18n/template.py
@@ -1,9 +1,15 @@
 from .translator import Translator
 
+_cached_translators = {}
+
 
 def flask_methods(app, get_translations_file):
     @app.context_processor
     def utility_processor():
         def trans(sentence):
-            return Translator(get_translations_file).translate(sentence)
+            filename = get_translations_file()
+            if filename not in _cached_translators:
+                _cached_translators[filename] = Translator(
+                    get_translations_file())
+            return _cached_translators[filename].translate(sentence)
         return dict(trans=trans)