diff --git a/edu_10gen.py b/edu_10gen.py
index 24cbed4..cbf43b8 100644
--- a/edu_10gen.py
+++ b/edu_10gen.py
@@ -109,8 +109,8 @@ def list_courses(self):
 
     def list_chapters(self, course_i):
         self.paragraphs = []
-        if course_i <= len(self.courses) and course_i >= 0:
-            course = self.courses[course_i - 1]
+        if course_i < len(self.courses) and course_i >= 0:
+            course = self.courses[course_i]
             course_name = course['name']
             courseware = self._br.open(SITE_URL+course['url'])
             courseware_soup = BeautifulSoup(courseware.read())