diff --git a/coverage/cmdline.py b/coverage/cmdline.py
index 046557862..c4a4f5d2d 100644
--- a/coverage/cmdline.py
+++ b/coverage/cmdline.py
@@ -113,7 +113,7 @@ class Opts:
     )
     include_namespace_packages = optparse.make_option(
         '', '--include_namespace_packages', action='store_true',
-        help="Include folders without and __init__.py in the Coverage.",
+        help="Include folders without an __init__.py in the Coverage.",
     )
     pylib = optparse.make_option(
         '-L', '--pylib', action='store_true',