diff --git a/translation/message_format.rst b/translation/message_format.rst
index 54672de3b43..0b282b3ab6c 100644
--- a/translation/message_format.rst
+++ b/translation/message_format.rst
@@ -70,6 +70,11 @@ The basic usage of the MessageFormat allows you to use placeholders (called
'say_hello' => "Hello {name}!",
];
+
+.. caution::
+
+ With the previous format, placeholders were often named between ``%``. This character is no longer valid with the ICU MessageFormat syntax. Be careful to rename your parameters.
+
Everything within the curly braces (``{...}``) is processed by the formatter
and replaced by its placeholder::
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