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-rw-r--r--doc/ci/variables/README.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/ci/variables/README.md b/doc/ci/variables/README.md
index d33275cae4f..2e66860e8d6 100644
--- a/doc/ci/variables/README.md
+++ b/doc/ci/variables/README.md
@@ -91,6 +91,7 @@ This means that the value of the variable will be hidden in job logs,
though it must match certain requirements to do so:
- The value must be in a single line.
+- The value must contain only letters, numbers, or underscores.
- The value must not have escape characters.
- The value must not use variables.
- The value must not have any whitespace.