1 files changed, 1 insertions, 0 deletions
diff --git a/README b/README
index c4b14f42..462e17c3 100644
--- a/README
+++ b/README
@@ -20,6 +20,7 @@ To compile ejabberd you need:
  - PAM library. Optional. For Pluggable Authentication Modules (PAM).
  - GNU Iconv 1.8 or higher, for the IRC Transport
    (mod_irc). Optional. Not needed on systems with GNU Libc.
+ - ImageMagick’s Convert program. Optional. For CAPTCHA challenges.
 
 
 1. Compile and install on *nix systems