diff --git a/articles/data-factory/parameters-data-flow.md b/articles/data-factory/parameters-data-flow.md
index 5d203a159573b..b26f08335f3ed 100644
--- a/articles/data-factory/parameters-data-flow.md
+++ b/articles/data-factory/parameters-data-flow.md
@@ -106,6 +106,9 @@ For example, if you wanted to map a string column based upon a parameter `column
 
 :::image type="content" source="media/data-flow/parameterize-column-name.png" alt-text="Passing in a column name as a parameter":::
 
+> [!NOTE]
+> In data flow expressions, string interpolation (substituting variables inside of the string) is not supported. Instead, concatenate the expression into string values. For example, `'string part 1' + $variable + 'string part 2'`
+
 ## Next steps
 * [Execute data flow activity](control-flow-execute-data-flow-activity.md)
 * [Control flow expressions](control-flow-expression-language-functions.md)