--- a/src/pyams_content/interfaces/__init__.py	Mon Jun 25 16:53:51 2018 +0200
+++ b/src/pyams_content/interfaces/__init__.py	Mon Jun 25 17:47:44 2018 +0200
@@ -93,7 +93,9 @@
     """Base content interface"""
 
     __name__ = TextLine(title=_("Unique key"),
-                        description=_("WARNING: this key can't be modified after creation!!!"),
+                        description=_("WARNING: this key can't be modified after creation!!! Spaces, "
+                                      "uppercase letters ou accentuated characters will be replaced "
+                                      "automatically."),
                         required=True)
 
     title = I18nTextLineField(title=_("Title"),