diff --git a/htdocs/conf/conf.php.example b/htdocs/conf/conf.php.example
index 98cb5e96dc3..fdc28d2c1fc 100644
--- a/htdocs/conf/conf.php.example
+++ b/htdocs/conf/conf.php.example
@@ -199,10 +199,11 @@ $dolibarr_main_authentication='dolibarr';
 // dolibarr_main_force_https
 // This parameter allows to force the HTTPS mode. 
 // 0 = No forced redirect
-// 1 = Force redirect to https until SCRIPT_URI start with https
-// 2 = Force redirect to https until SERVER["HTTPS"] is 'on'
+// 1 = Force redirect to https, until SCRIPT_URI start with https into response
+// 2 = Force redirect to https, until SERVER["HTTPS"] is 'on' into response
 // Warning: If you enable this parameter, your web server must be configured
-// to respond URL with https protocol.
+// to respond URL with https protocol. Try different values (1,2) if you 
+// experience problems.
 // Default value: 0
 // Possible values: 0, 1 or 2
 // Examples:
@@ -263,6 +264,17 @@ $dolibarr_main_db_prefix='';
 // Examples:
 // $dolibarr_strict_mode=0;
 
+// dolibarr_pdf_force_fpdf
+// Set this to 1 to use the libray FPDF instead of TCPDF. FPDF is not embedded with Dolibarr, 
+// so you also have to uncomment line $dolibarr_lib_FPDF_PATH to provide path to FPDF library.
+// Warning: FPDF does not support all features supported by TCPDF used by default. So using
+// this library instead of TCPF will break some features like transparent logo, cyrillic, arab,
+// and asiatic languages, total number of pages, ...
+// Default value: 0
+// Examples:
+// $dolibarr_pdf_force_fpdf=1;
+
+
 
 //#################################
 // Path to external libraries/fonts
@@ -270,13 +282,14 @@ $dolibarr_main_db_prefix='';
 
 // Value to overwrite path to use shared libraries instead of embedded one
 //$dolibarr_lib_ADODB_PATH='/usr/share/php/adodb';
+//$dolibarr_lib_TCPDF_PATH='/usr/share/php/tcpdf';
 //$dolibarr_lib_FPDI_PATH='/usr/share/php/fpdi';
+//$dolibarr_lib_FPDF_PATH='/usr/share/php/fpdf';
 //$dolibarr_lib_GEOIP_PATH='';
 //$dolibarr_lib_NUSOAP_PATH='/usr/share/php/nusoap';
 //$dolibarr_lib_PHPEXCEL_PATH='';
 //$dolibarr_lib_ODTPHP_PATH='';
 //$dolibarr_lib_ODTPHP_PATHTOPCLZIP="/usr/share/php/libphp-pclzip";
-//$dolibarr_lib_TCPDF_PATH='';
 // Value to overwrite path to use shared javascript instead of embedded one
 //$dolibarr_js_CKEDITOR='/javascript/ckeditor';
 //$dolibarr_js_JQUERY='/javascript/jquery';
@@ -292,6 +305,7 @@ $dolibarr_main_db_prefix='';
 //##############################
 
 // multicompany_transverse_mode
+// Prerequisite: Need external module "multicompany"
 // Pyramidal (0): The rights and groups are managed in each entity,
 // users belong to the entity for their rights.
 // Transversal (1): The groups can belong only to the master entity