diff --git a/include/event2/buffer.h b/include/event2/buffer.h
index d29dfd0d..3300c8cc 100644
--- a/include/event2/buffer.h
+++ b/include/event2/buffer.h
@@ -303,7 +303,6 @@ int evbuffer_add_vprintf(struct evbuffer *buf, const char *fmt, va_list ap);
 
   @param buf the evbuffer to be drained
   @param len the number of bytes to drain from the beginning of the buffer
-  @return 0 if successful, or -1 if an error occurred
  */
 void evbuffer_drain(struct evbuffer *buf, size_t len);