diff --git a/clients/tabby-chat-panel/src/index.ts b/clients/tabby-chat-panel/src/index.ts
index 27a02e8e44c7..4cb7a4c89ac9 100644
--- a/clients/tabby-chat-panel/src/index.ts
+++ b/clients/tabby-chat-panel/src/index.ts
@@ -53,6 +53,9 @@ export type Location = number | LineRange | Position | PositionRange
 
 export interface FileContext {
   kind: 'file'
+  /**
+   * If the range is undefined, it implies that the context is the entire file.
+   */
   range?: LineRange
   filepath: string
   content: string