diff --git a/aprendizations/learnapp.py b/aprendizations/learnapp.py
index ed57c84..a72fcd4 100644
--- a/aprendizations/learnapp.py
+++ b/aprendizations/learnapp.py
@@ -352,7 +352,7 @@ class LearnApp(object):
         topics: Dict[str, Dict] = config.get('topics', {})
         g.add_nodes_from(topics.keys())
         for tref, attr in topics.items():
-            logger.debug(f'       + {tref}...')
+            logger.debug(f'       + {tref}')
             for d in attr.get('deps', []):
                 if d not in g.nodes():
                     logger.error(f'Topic "{tref}" depends on "{d}" but it '
diff --git a/aprendizations/questions.py b/aprendizations/questions.py
index d66c2c6..82bc440 100644
--- a/aprendizations/questions.py
+++ b/aprendizations/questions.py
@@ -254,15 +254,15 @@ class QuestionText(Question):
     # apply optional filters to the answer
     def transform(self, ans):
         for f in self['transform']:
-            if f == 'remove_space':
+            if f == 'remove_space':  # removes all spaces
                 ans = ans.replace(' ', '')
-            elif f == 'trim':
+            elif f == 'trim':        # removes spaces around
                 ans = ans.strip()
-            elif f == 'normalize_space':
+            elif f == 'normalize_space':  # replaces multiple spaces by one
                 ans = re.sub(r'\s+', ' ', ans.strip())
-            elif f == 'lower':
+            elif f == 'lower':       # convert to lowercase
                 ans = ans.lower()
-            elif f == 'upper':
+            elif f == 'upper':       # convert to uppercase
                 ans = ans.upper()
             else:
                 logger.warning(f'in "{self["ref"]}", unknown transform "{f}"')
diff --git a/aprendizations/serve.py b/aprendizations/serve.py
index 0784e9d..5ba1bc8 100644
--- a/aprendizations/serve.py
+++ b/aprendizations/serve.py
@@ -434,7 +434,7 @@ def run_webserver(app,
     except Exception:
         logger.critical('Failed to start web application.')
         raise
-        sys.exit(1)
+        # sys.exit(1)
     else:
         logger.info('Web application started (tornado.web.Application)')
 
--
libgit2 0.21.2