diff --git a/questions.py b/questions.py
index 78498a6..3e2e6b7 100644
--- a/questions.py
+++ b/questions.py
@@ -8,7 +8,7 @@
 #
 #   # read question from file
 #   qdict = tools.load_yaml(filename)
-#   qfactory = QFactory(question)
+#   qfactory = QFactory(qdict)
 #   question = qfactory.generate()
 #
 #   # experiment answering one question and correct it
@@ -102,7 +102,7 @@ class QuestionRadio(Question):
         # set defaults if missing
         self.set_defaults({
             'text': '',
-            'correct': 0,
+            'correct': 0.0,
             'shuffle': True,
             'discount': True,
             })
@@ -234,6 +234,7 @@ class QuestionText(Question):
         super().correct(answer)
 
         if self['answer']:
+            # FIXME in self['answer'][0] why [0]???
             self['grade'] = 1.0 if self['answer'][0] in self['correct'] else 0.0
 
         return self['grade']
@@ -263,6 +264,7 @@ class QuestionTextRegex(Question):
         super().correct(answer)
         if self['answer']:
             try:
+                # FIXME why [0]?
                 self['grade'] = 1.0 if re.match(self['correct'], self['answer'][0]) else 0.0
             except TypeError:
                 logger.error('While matching regex {0} with answer {1}.'.format(self['correct'], self['answer'][0]))
@@ -298,7 +300,7 @@ class QuestionTextNumeric(Question):
             try:
                 self['grade'] = 1.0 if lower <= float(self['answer'][0]) <= upper else 0.0
             except TypeError:
-                logger.error('While matching regex {0} with answer {1}.'.format(self['correct'], self['answer'][0]))
+                logger.error('While matching regex {0} with answer {1}.'.format(self['correct'], self['answer'][0])) # FIXME [0], regex???
             except ValueError:
                 self['comments'] = f'A resposta "{self["answer"][0]}" não é numérica.'
         return self['grade']
@@ -337,7 +339,7 @@ class QuestionTextArea(Question):
             # correct answer
             out = run_script(
                 script=self['correct'],
-                stdin=self['answer'][0],
+                stdin=self['answer'][0],# FIXME [0]
                 timeout=self['timeout']
                 )
             if type(out) in (int, float):
diff --git a/static/mathjax b/static/mathjax
index 2bf521d..6fea3a3 120000
--- a/static/mathjax
+++ b/static/mathjax
@@ -1 +1 @@
-../../perguntations/static/mathjax-2.7/
\ No newline at end of file
+../../perguntations/static/MathJax
\ No newline at end of file
--
libgit2 0.21.2