diff --git a/README b/README
index a5ae0f15..d9429f86 100644
--- a/README
+++ b/README
@@ -26,8 +26,11 @@ Optional Requirements
 SSL support:
  - openssl 0.9.7d or later (try installing openssl-dev, openssl-devel or
    libssl-dev)
+Asynchronous DNS lookup:
+ - c-ares 1.5.3 or later, older releases don't provide a pkg-config file
+   (try installing libc-ares-dev or c-ares)
 modperl:
- - This needs perl and the bundled libperl
+ - This needs perl and its bundled libperl
 saslauth:
  - This module needs cyrus-sasl2