diff --git a/src/Symfony/Contracts/Cache/ItemInterface.php b/src/Symfony/Contracts/Cache/ItemInterface.php
index 8c4c51253eef7..f1bdf7c1d2b38 100644
--- a/src/Symfony/Contracts/Cache/ItemInterface.php
+++ b/src/Symfony/Contracts/Cache/ItemInterface.php
@@ -39,8 +39,13 @@ interface ItemInterface extends CacheItemInterface
/**
* Reserved characters that cannot be used in a key or tag.
+ *
+ * Please note that this list should include a colon (:) to fully respect
+ * the PSR. A PR is opened to fix this in PSR-6
+ * (https://github.com/php-fig/fig-standards/pull/1269). So Symfony is a bit
+ * ahead of time on this one.
*/
- public const RESERVED_CHARACTERS = '{}()/\@:';
+ public const RESERVED_CHARACTERS = '{}()/\@';
/**
* Adds a tag to a cache item.
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