diff --git a/src-tsp/main.tsp b/src-tsp/main.tsp
index 7d9b033..224e64e 100644
--- a/src-tsp/main.tsp
+++ b/src-tsp/main.tsp
@@ -118,6 +118,12 @@ model ModuleDefaults {
    * https://blue-build.org/reference/module/#no-cache-optional
    */
   `no-cache`?: boolean = false;
+
+  /** The version of nushell to use for this module.
+   * This will override the version specified in the module's
+   * label `org.blue-build.nushell-version`.
+   */
+  `nushell-version`?: string;
 }
 
 model CustomModule {