diff --git a/config.md b/config.md
index 0c490d8b4..5f779fcd7 100644
--- a/config.md
+++ b/config.md
@@ -436,7 +436,6 @@ Annotations MUST be a key-value map.
 If there are no annotations then this property MAY either be absent or an empty map.
 
 Keys MUST be strings.
-Keys MUST be unique within this map.
 Keys MUST NOT be an empty string.
 Keys SHOULD be named using a reverse domain notation - e.g. `com.example.myKey`.
 Keys using the `org.opencontainers` namespace are reserved and MUST NOT be used by subsequent specifications.