diff --git a/bin/help.ts b/bin/help.ts
index 1c2c1a7..710f209 100644
--- a/bin/help.ts
+++ b/bin/help.ts
@@ -41,9 +41,9 @@ function usage(cmd: string, signature?: ExportInfo) {
   if (signature?.kind === "function" && signature.signatures.length) {
     const params = signature.signatures[0]!.params
     for (const param of params) {
-      let desc = `${param.name}=`
-      desc += param.default ? `${param.default}` : `<${param.type}>`
-      out.push(desc)
+      let desc = param.default ? `[${param.name}=${param.default}]` : `<${param.name}>`
+      desc +=
+        out.push(desc)
     }
   }