diff --git a/docs/user-guide/cluster-docker-consul.md b/docs/user-guide/cluster-docker-consul.md
index 429432c8a..d9e8417bb 100644
--- a/docs/user-guide/cluster-docker-consul.md
+++ b/docs/user-guide/cluster-docker-consul.md
@@ -9,9 +9,9 @@ If you want to use Let's Encrypt with Træfik, sharing configuration or TLS cert
 Ok, could we mount a shared volume used by all my instances? Yes, you can, but it will not work.
 When you use Let's Encrypt, you need to store certificates, but not only.
 When Træfik generates a new certificate, it configures a challenge and once Let's Encrypt will verify the ownership of the domain, it will ping back the challenge.
-If the challenge is not knowing by other Træfik instances, the validation will fail.
+If the challenge is not known by other Træfik instances, the validation will fail.
 
-For more information about challenge: [Automatic Certificate Management Environment (ACME)](https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#http-challenge)
+For more information about the challenge: [Automatic Certificate Management Environment (ACME)](https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#http-challenge)
 
 ## Prerequisites