diff --git a/specification/text_structure/find_structure/FindStructureRequest.ts b/specification/text_structure/find_structure/FindStructureRequest.ts
index 8bdaeb0580..34c96d20f2 100644
--- a/specification/text_structure/find_structure/FindStructureRequest.ts
+++ b/specification/text_structure/find_structure/FindStructureRequest.ts
@@ -67,7 +67,7 @@ export interface Request<TJsonDocument> {
      * If this parameter is not specified, the structure finder uses the column names from the header row of the text.
      * If the text does not have a header role, columns are named "column1", "column2", "column3", for example.
      */
-    column_names?: string
+    column_names?: string | string[]
     /**
      * If you have set `format` to `delimited`, you can specify the character used to delimit the values in each row.
      * Only a single character is supported; the delimiter cannot have multiple characters.