diff --git a/etc/ironic/ironic.conf.sample b/etc/ironic/ironic.conf.sample
index 5f67e28737..30fd4c6f01 100644
--- a/etc/ironic/ironic.conf.sample
+++ b/etc/ironic/ironic.conf.sample
@@ -987,8 +987,8 @@
 # Maximum retries for iBoot operations (integer value)
 #max_retry=3
 
-# Time between retry attempts for iBoot operations (integer
-# value)
+# Time (in seconds) between retry attempts for iBoot
+# operations (integer value)
 #retry_interval=1
 
 
@@ -1726,7 +1726,8 @@
 # value)
 #tftp_server=$my_ip
 
-# ironic-conductor node's TFTP root path. (string value)
+# ironic-conductor node's TFTP root path. The ironic-conductor
+# must have read/write access to this path. (string value)
 #tftp_root=/tftpboot
 
 # On ironic-conductor node, directory where master TFTP images
diff --git a/ironic/drivers/modules/pxe.py b/ironic/drivers/modules/pxe.py
index 3fb271a9ca..5284d605f5 100644
--- a/ironic/drivers/modules/pxe.py
+++ b/ironic/drivers/modules/pxe.py
@@ -54,10 +54,12 @@ pxe_opts = [
                       'configuration for UEFI boot loader.')),
     cfg.StrOpt('tftp_server',
                default='$my_ip',
-               help=_('IP address of ironic-conductor node\'s TFTP server.')),
+               help=_("IP address of ironic-conductor node's TFTP server.")),
     cfg.StrOpt('tftp_root',
                default='/tftpboot',
-               help=_('ironic-conductor node\'s TFTP root path.')),
+               help=_("ironic-conductor node's TFTP root path. The "
+                      "ironic-conductor must have read/write access to this "
+                      "path.")),
     cfg.StrOpt('tftp_master_path',
                default='/tftpboot/master_images',
                help=_('On ironic-conductor node, directory where master TFTP '