diff --git a/.gitignore b/.gitignore
index 3a47612f4..0457cc012 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ _site
 /node_modules
 /vendor
 .idea/
+.cache/
 
 # Generated by 'yarn dev'
 /_includes/2017/critical/*
diff --git a/docker.md b/docker.md
index f1c825c7a..ac19423e8 100644
--- a/docker.md
+++ b/docker.md
@@ -183,6 +183,28 @@ docker volume prune
 
 Delete all the volumes
 
+### Systems
+
+```sh
+docker system df
+```
+
+Show docker disk usage
+
+```sh
+docker system events
+```
+
+Get real time events from the server
+
+```sh
+docker system info
+```
+
+Display system-wide information
+
+
+
 Also see
 --------