diff --git a/sportsreference/nba/constants.py b/sportsreference/nba/constants.py
index <HASH>..<HASH> 100644
--- a/sportsreference/nba/constants.py
+++ b/sportsreference/nba/constants.py
@@ -292,6 +292,7 @@ PLAYER_SCHEME = {
 }
 
 NATIONALITY = {
+    'ao': 'Angola',
     'ag': 'Antigua and Barbuda',
     'ar': 'Argentina',
     'au': 'Australia',
@@ -324,6 +325,7 @@ NATIONALITY = {
     'gh': 'Ghana',
     'gr': 'Greece',
     'gp': 'Guadeloupe',
+    'gn': 'Guinea',
     'gy': 'Guyana',
     'ht': 'Haiti',
     'hu': 'Hungary',
Add support for additional NBA nationalities

After the summer <I> NBA draft and transfer window, a couple of new
players became the first ever players to represent their country in the
NBA. As a result, support for their countries was not included yet,
preventing sportsreference from pulling stats from these players without
throwing errors. With support added, all NBA teams can now be pulled
with every roster able to be analyzed.