diff --git a/Caddyfile-Directives.md b/Caddyfile-Directives.md
index b4a78b1..6c9a8bb 100644
--- a/Caddyfile-Directives.md
+++ b/Caddyfile-Directives.md
@@ -5,6 +5,15 @@ This list is presented alphabetically. The order in which directives appear in t
 ## List of directives
 
 
+#### cpu
+
+Limits use of processor cores to the number (or percentage) specified. By default, all cores may be used to serve requests. This directive is actually process-wide, meaning that it applies to ALL servers started with the same instance of `caddy`. If specified multiple times, the highest value is used. Can be a number (at least 1) or a percent (between 1% and 100%).
+
+```
+cpu 50%
+```
+
+
 #### ext
 
 Internally adds extensions to the requests. Extensions will be tried in the order listed. This allows you to easily serve cleaner URLs.