diff --git a/config/daemon/systemd.md b/config/daemon/systemd.md
index 16e61df8f4..57d7863603 100644
--- a/config/daemon/systemd.md
+++ b/config/daemon/systemd.md
@@ -96,18 +96,34 @@ you need to add this configuration in the Docker systemd service file.
     ```
 
 3.  If you have internal Docker registries that you need to contact without
-    proxying you can specify them via the `NO_PROXY` environment variable:
+    proxying you can specify them via the `NO_PROXY` environment variable.
 
+    The `NO_PROXY` variable specifies a string that contains comma-separated
+    values for hosts that should be excluded from proxying. These are the
+    options you can specify to exclude hosts: 
+    * IP address prefix (`1.2.3.4`) or in CIDR notation (`1.2.3.4/8`)    
+    * Domain name, or a special DNS label (`*`)
+    * A domain name matches that name and all subdomains. A domain name with
+      a leading "." matches subdomains only. For example, given the domains
+      `foo.example.com` and `example.com`:
+      * `example.com` matches `example.com` and `foo.example.com`, and
+      * `.example.com` matches only `foo.example.com`
+    * A single asterisk (`*`) indicates that no proxying should be done
+    * Literal port numbers are accepted by IP address prefixes (`1.2.3.4:80`)
+      and domain names (`foo.example.com:80`)
+    
+    Config examples:
+    
     ```conf
     [Service]    
-    Environment="HTTP_PROXY=http://proxy.example.com:80/" "NO_PROXY=localhost,127.0.0.1,docker-registry.somecorporation.com"
+    Environment="HTTP_PROXY=http://proxy.example.com:80/" "NO_PROXY=localhost,127.0.0.1,docker-registry.example.com,.corp"
     ```
 
     Or, if you are behind an HTTPS proxy server:
 
     ```conf
     [Service]    
-    Environment="HTTPS_PROXY=https://proxy.example.com:443/" "NO_PROXY=localhost,127.0.0.1,docker-registry.somecorporation.com"
+    Environment="HTTPS_PROXY=https://proxy.example.com:443/" "NO_PROXY=localhost,127.0.0.1,docker-registry.example.com,.corp"
     ```
 
 4.  Flush changes: