diff --git a/httpie/cli.py b/httpie/cli.py
index 75dfd845..eeb66a3c 100644
--- a/httpie/cli.py
+++ b/httpie/cli.py
@@ -199,7 +199,7 @@ output_processing.add_argument(
     default=DEFAULT_STYLE,
     choices=AVAILABLE_STYLES,
     help="""
-    Output coloring style (default is "{default}"). On of:
+    Output coloring style (default is "{default}"). One of:
 
 {available}