diff --git a/website/docs/modules/sources.html.markdown b/website/docs/modules/sources.html.markdown
index 6454db99c..d6f11b15e 100644
--- a/website/docs/modules/sources.html.markdown
+++ b/website/docs/modules/sources.html.markdown
@@ -357,7 +357,7 @@ information.
 
 You can use archives stored in S3 as module sources using the special `s3::`
 prefix, followed by
-[a S3 bucket object URL](http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html#access-bucket-intro).
+[an S3 bucket object URL](http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html#access-bucket-intro).
 
 ```hcl
 module "consul" {