diff --git a/docs/labels.md b/docs/labels.md
index 5dab5c41218..3c10962ed80 100644
--- a/docs/labels.md
+++ b/docs/labels.md
@@ -34,7 +34,7 @@ These are just examples; you are free to develop your own conventions.
 ## Syntax and character set
 
 _Labels_ are key value pairs. Valid label keys have two segments: an optional prefix and name, separated by a slash (`/`).  The name segment is required and must be 63 characters or less, beginning and ending with an alphanumeric character (`[a-z0-9A-Z]`) with dashes (`-`), underscores (`_`), dots (`.`), and alphanumerics between.  The prefix is optional.  If specified, the prefix must be a DNS subdomain: a series of DNS labels separated by dots (`.`), not longer than 253 characters in total, followed by a slash (`/`).
-If the prefix is omitted, the label key is presumed to be private to the user. System components which use labels must specify a prefix.  The `kubernetes.io/` prefix is reserved for kubernetes core components.
+If the prefix is omitted, the label key is presumed to be private to the user. Automated system components (e.g. ```kube-scheduler```, ```kube-controller-manager```, ```kube-apiserver```, ```kubectl```, or other third-party automation) which add labels to end-user objects must specify a prefix.  The `kubernetes.io/` prefix is reserved for kubernetes core components.
 
 Valid label values must be 63 characters or less and must be empty or begin and end with an alphanumeric character (`[a-z0-9A-Z]`) with dashes (`-`), underscores (`_`), dots (`.`), and alphanumerics between.