diff --git a/src/parser.ts b/src/parser.ts
index d9dc4d4..3f7ad78 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -137,10 +137,11 @@ const ERROR_CONTEXT = /(?<=([^\n]{0,50}))([^\n]{0,50})/y;
  * Parse out a Notcl script into an easier-to-interpret representation.
  * No script is actually executed yet.
  *
- * @param - code to parse
- * @returns - parsed list of commands, or error message on failure
+ * @param code code to parse
+ * @param offset source position of code, if embedded in a larger source document
+ * @returns parsed list of commands, or error message on failure
  */
-export function parse(code: string): [true, Script] | [false, string] {
+export function parse(code: string, offset = 0): [true, Script] | [false, string] {
   /* Parse */
   const [commands, errorPos, expected] = Script.match(code, 0);