diff --git a/ext/agoo/rserver.c b/ext/agoo/rserver.c
index 6f43f38..35e5430 100644
--- a/ext/agoo/rserver.c
+++ b/ext/agoo/rserver.c
@@ -301,7 +301,7 @@ configure(agooErr err, int port, const char *root, VALUE options) {
  *
  *   - *:max_push_pending* [_Integer_] maximum number or outstanding push messages, less than 1000.
  *
- *   - *:ssl_sert* [_String_] filepath to the SSL certificate file.
+ *   - *:ssl_cert* [_String_] filepath to the SSL certificate file.
  *
  *   - *:ssl_key* [_String_] filepath to the SSL private key file.
  *