diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 4493fd0e1..6b302da38 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -261,7 +261,7 @@ class YoutubeDL(object):
                        - "detect_or_warn": check whether we can do anything
                                            about it, warn otherwise (default)
     source_address:    Client-side IP address to bind to.
-    call_home:         Boolean, true iff we are allowed to contact the
+    call_home:         Boolean, true if we are allowed to contact the
                        youtube-dl servers for debugging.
     sleep_interval:    Number of seconds to sleep before each download when
                        used alone or a lower bound of a range for randomized