diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 6afc1b7307..d50b7cfed3 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -241,7 +241,7 @@ class YoutubeDL(object):
                        - "detect_or_warn": check whether we can do anything
                                            about it, warn otherwise (default)
     source_address:    (Experimental) Client-side IP address to bind to.
-    call_home:         Boolean, true if we are allowed to contact the
+    call_home:         Boolean, true iff we are allowed to contact the
                        youtube-dl servers for debugging.
     sleep_interval:    Number of seconds to sleep before each download.
     listformats:       Print an overview of available video formats and exit.
@@ -590,7 +590,7 @@ class YoutubeDL(object):
             return None
 
     def _match_entry(self, info_dict, incomplete):
-        """ Returns None if the file should be downloaded """
+        """ Returns None iff the file should be downloaded """
 
         video_title = info_dict.get('title', info_dict.get('id', 'video'))
         if 'title' in info_dict:
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index e583299c57..9c1c0e0bdf 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1857,7 +1857,7 @@ def encode_data_uri(data, mime_type):
 
 
 def age_restricted(content_limit, age_limit):
-    """ Returns True if the content should be blocked """
+    """ Returns True iff the content should be blocked """
 
     if age_limit is None:  # No limit set
         return False