diff --git a/README.md b/README.md
index 6640d5b..2ba51fa 100755
--- a/README.md
+++ b/README.md
@@ -38,4 +38,17 @@ information regarding these requirements see the INSTALL.md file in this folder.
 
 Please see the INSTALL.md in this folder.
 
+# 6. Troubleshooting
+
+## Problem with Cal/CardDAV auth
+On webservers where PHP is served as FastCGI (check your phpinfo()
+to find out if that's the case for you), Apache does not pass HTTP
+Auth informations to PHP, and thus preventing Cal/CardDAV to auth
+requests properly. Baïkal tries to address this issue by re-routing
+HTTP Auth informations using Apaches mod_rewrite. This is done by the
+Apache config directives found in the /.htaccess file that comes with Baïkal
+(or /html/.htaccess for the non-ftp package).
+Note: if this file is empty / does not exist, you should try to add it manually
+(sometimes FTP clients decide to not send files with names beginning with a dot ".")
+
 -- Jérôme Schneider <mail@jeromeschneider.fr>  Sat, 12 May 2012 23:45:00 +0100
\ No newline at end of file