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-rw-r--r--doc/ci/yaml/README.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/ci/yaml/README.md b/doc/ci/yaml/README.md
index 4e925346ff5..034ac6b4730 100644
--- a/doc/ci/yaml/README.md
+++ b/doc/ci/yaml/README.md
@@ -252,6 +252,8 @@ The `cache:key` variable can use any of the [predefined variables](../variables/
The default key is **default** across the project, therefore everything is
shared between each pipelines and jobs by default, starting from GitLab 9.0.
+>**Note:** The `cache:key` variable cannot contain the `/` character.
+
---
**Example configurations**