diff --git a/weboob/applications/boobank/boobank.py b/weboob/applications/boobank/boobank.py
index 79246a68..d7cbb01e 100644
--- a/weboob/applications/boobank/boobank.py
+++ b/weboob/applications/boobank/boobank.py
@@ -29,7 +29,7 @@ __all__ = ['Boobank']
 
 
 class QifFormatter(IFormatter):
-    MANDATORY_FIELDS = ('id', 'date', 'label', 'amount')
+    MANDATORY_FIELDS = ('id', 'date', 'label', 'amount', 'category')
 
     count = 0
 
@@ -43,6 +43,7 @@ class QifFormatter(IFormatter):
         result += u'D%s\n' % item['date'].strftime('%d/%m/%y')
         result += u'T%s\n' % item['amount']
         result += u'M%s\n' % item['label']
+        result += u'N%s\n' % item['category']
         result += u'^\n'
         self.count += 1
         return result
diff --git a/weboob/capabilities/bank.py b/weboob/capabilities/bank.py
index 2458871b..e98a25ec 100644
--- a/weboob/capabilities/bank.py
+++ b/weboob/capabilities/bank.py
@@ -59,6 +59,7 @@ class Operation(CapBaseObject):
         self.add_field('date', (basestring, datetime, date))
         self.add_field('label', unicode)
         self.add_field('amount', float)
+        self.add_field('category', unicode)
 
     def __repr__(self):
         return "<Operation date='%s' label='%s' amount=%s>" % (self.date,