diff --git a/adaptive_game_module/flag_checker.py b/adaptive_game_module/flag_checker.py
index bea033a..5ea40d1 100644
--- a/adaptive_game_module/flag_checker.py
+++ b/adaptive_game_module/flag_checker.py
@@ -1,15 +1,22 @@
 import yaml
 
 class FlagChecker:
+    """Class that checks if flags are correct, and also remembers wrong flags.
+
+    Needs a file with the flags to levels written in."""
     def __init__(self, filename):
         self.wrong_flags = {}
         self.read_keys(filename)
 
     def read_keys(self, filename):
+        """Reads levels and flags from file `filename`"""
         with open(filename) as f:
             self.flags = yaml.load(f, Loader=yaml.FullLoader)
 
     def check_flag(self, level, flag):
+        """Checks if `flag` is a correct flag for `level`.
+
+        If it isn't, it adds `flag` to the list of incorrect flags."""
         if self.flags[level] == flag:
             return True
         else:
@@ -19,5 +26,6 @@ class FlagChecker:
             return False
 
     def log_to_file(self, filename):
+        """Logs everything to a file."""
         with open(filename, 'a') as f:
             yaml.dump(self.wrong_flags, f)
\ No newline at end of file