diff --git a/README.md b/README.md
index 0ebd034..b0aa3c7 100644
--- a/README.md
+++ b/README.md
@@ -158,7 +158,7 @@ Exports the following functions:
 
 - `http_set_ua(ua_str='Mozilla/5.0')`: set a default HTTP user agent string
 - `http_fetch(url, useragent=None, hdrs={})`: fetch text content from a URL into a string (returns `(status_code, content)` tuple)
-- `auth_header(username, password)`: get an dictionary fragment with the corresponding HTTP Basic Auth header according to the username and password
+- `auth_header(username, password)`: get a dictionary fragment with the corresponding HTTP Basic Auth header according to the username and password
 - `wget(url, filename='', useragent=None, hdrs={})`: download a file into a local path (returns `(status_code, filename)` tuple)
 - `wput(url, file_path, field_name="file", method="POST", format="x-www-form-urlencoded", headers={}, useragent=None)`: upload a file from a local path in the `x-www-form-urlencoded` or JSON format (returns `(status_code, content)` tuple)