diff --git a/README.md b/README.md
index a140d11..aca9f47 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,11 @@
 ca-scripts
 ==========
 
-A set of `bash(1)` scripts for working with SSL Certificate Authorities.
+A set of **bash**(1) scripts for working with SSL Certificate Authorities.
 
 These scripts are designed to provide a configurable wrapping layer around
-[openssl](http://www.openssl.org/), similar to CA.pl. They're potentially a
-little heavyweight if you just need a single self-signed certificate to secure
+[**openssl**(1)](http://www.openssl.org/), similar to CA.pl. They're potentially
+a little heavyweight if you just need a single self-signed certificate to secure
 an HTTPs webserver, but they may come in handy if you want to:
 
   * Generate multiple service certificates signed by a single authority
@@ -13,6 +13,13 @@ an HTTPs webserver, but they may come in handy if you want to:
   * Provide client certificates for S/MIME encrypted e-mail or code signing
   * Easily set extensions such as x509v3 subjectAltName in your certificates
 
+Portability
+-----------
+
+Currently, these scripts are limited to systems with a recent install of
+**openssl**(1), GNU **date**(1) -- sorry BSD folks; patches welcome -- and
+version 3 or greater of **bash**(1).
+
 Installation
 ------------