diff --git a/aprendizations/learnapp.py b/aprendizations/learnapp.py
index 5afa575..a974250 100644
--- a/aprendizations/learnapp.py
+++ b/aprendizations/learnapp.py
@@ -381,8 +381,11 @@ class LearnApp(object):
     def populate_graph(self, config: Dict[str, Any]) -> None:
         g = self.deps       # dependency graph
         defaults = {
-            'type': 'topic',
-            'file': 'questions.yaml',
+            'type': 'topic',  # chapter
+            # 'file': 'questions.yaml',  # deprecated
+            'learn_file': 'learn.yaml',
+            'practice_file': 'questions.yaml',
+
             'shuffle_questions': True,
             'choose': 9999,
             'forgetting_factor': 1.0,  # no forgetting
@@ -402,7 +405,7 @@ class LearnApp(object):
 
             t = g.nodes[tref]  # get current topic node
             t['name'] = attr.get('name', tref)
-            t['questions'] = attr.get('questions', [])
+            t['questions'] = attr.get('questions', [])  # FIXME unused??
 
             for k, default in defaults.items():
                 t[k] = attr.get(k, default)
@@ -438,9 +441,8 @@ class LearnApp(object):
         g = self.deps
         t = g.nodes[tref]  # get node
         # load questions as list of dicts
-        topicpath: str = path.join(g.graph['prefix'], tref)
         try:
-            fullpath: str = path.join(topicpath, t['file'])
+            fullpath: str = path.join(t['path'], t['file'])
         except Exception:
             msg1 = f'Invalid topic "{tref}"'
             msg2 = f'Check dependencies of: {", ".join(g.successors(tref))}'
@@ -457,6 +459,7 @@ class LearnApp(object):
                 msg = f'Failed to load "{fullpath}"'
                 logger.error(msg)
                 raise LearnException(msg)
+
         if not isinstance(questions, list):
             msg = f'File "{fullpath}" must be a list of questions'
             logger.error(msg)
@@ -470,12 +473,12 @@ class LearnApp(object):
         for i, q in enumerate(questions):
             qref = q.get('ref', str(i))  # ref or number
             if qref in localrefs:
-                msg = f'Duplicate ref "{qref}" in "{topicpath}"'
+                msg = f'Duplicate ref "{qref}" in "{t["path"]}"'
                 raise LearnException(msg)
             localrefs.add(qref)
 
             q['ref'] = f'{tref}:{qref}'
-            q['path'] = topicpath
+            q['path'] = t['path']
             q.setdefault('append_wrong', t['append_wrong'])
 
         # if questions are left undefined, include all.
--
libgit2 0.21.2