diff --git a/src/validate.ts b/src/validate.ts
index 89fd669..60c1b65 100644
--- a/src/validate.ts
+++ b/src/validate.ts
@@ -23,6 +23,7 @@ const allowedModules = [
   "CourseMaterials",
   "Plagiarism",
   "RainbowGrades",
+  "Calendar",
   "System",
   "Developer",
   "API",
diff --git a/test/validate.spec.ts b/test/validate.spec.ts
index ef0c1c5..fd6984b 100644
--- a/test/validate.spec.ts
+++ b/test/validate.spec.ts
@@ -117,7 +117,7 @@ describe("validate", () => {
           )
         ).to.throw(`Errors detected in title:
   - Invalid type, expected one of Bugfix, Feature, Refactor, Testing, Documentation, VPAT, UI/UX, Dependency, DevDependency. Got Fake.
-  - Invalid module, expected one of Submission, Autograding, Forum, Notifications, TAGrading, InstructorUI, SubminiPolls, HelpQueue, CourseMaterials, Plagiarism, RainbowGrades, System, Developer, API. Got Error.
+  - Invalid module, expected one of Submission, Autograding, Forum, Notifications, TAGrading, InstructorUI, SubminiPolls, HelpQueue, CourseMaterials, Plagiarism, RainbowGrades, Calendar, System, Developer, API. Got Error.
   - Too long a message, expected at most 40 characters, got 56 characters.`);
       });
     });