diff --git a/docs/configuration/backends/docker.md b/docs/configuration/backends/docker.md
index 2ab4aae71..3515660b7 100644
--- a/docs/configuration/backends/docker.md
+++ b/docs/configuration/backends/docker.md
@@ -22,7 +22,7 @@ endpoint = "unix:///var/run/docker.sock"
 # Default base domain used for the frontend rules.
 # Can be overridden by setting the "traefik.domain" label on a container.
 #
-# Required
+# Optional
 #
 domain = "docker.localhost"
 
@@ -450,4 +450,4 @@ Below is a recap of the behavior of `usebindportip` in different situations.
 | LblPort            | ExtIp1:ExtPort1:IntPort1 & ExtIp2:LblPort:IntPort2 | ExtIp2:LblPort |
 
 !!! note
-    In the above table, ExtIp stands for "external IP found in the binding", IntIp stands for "internal network container's IP", ExtPort stands for "external Port found in the binding", and IntPort stands for "internal network container's port."
\ No newline at end of file
+    In the above table, ExtIp stands for "external IP found in the binding", IntIp stands for "internal network container's IP", ExtPort stands for "external Port found in the binding", and IntPort stands for "internal network container's port."