update configuration information

1 files changed, 22 insertions, 19 deletions

diff --git a/README.md b/README.md
index 4c4e6a0..2136937 100644
--- a/README.md
+++ b/README.md
@@ -13,16 +13,17 @@ For Debian/Ubuntu systems: apt install python3-dns python3-urllib3
 For Fedora systems: dnf install python3-dns python3-urllib3
 
 # Configuration
-The only configuration file/item is if you want to use the file
-/etc/he-dns-secret to contain the key for authenticating to
-dns.he.net. Otherwise, you can provide it on the command line with the
-**-s** option.
+Unless using the ``--key`` argument, keys for the dyanmic record
+are read from ``/etc/he-dyndns.conf`` or from an alternative
+location specified by ``--keyfile``. The configuration file
+format is one section [keys] with record = key pairs. For example:
 
-The **/etc/he-dns-secret** file is sourced into the Bash environment by the
-script. It can contain any shell code that can execute when being called with
-a "source" function. The only key thing that matters is that the variable
-CODE is defined by the script. Since this file will be sourced into the
-program, ensure proper security is applied to this file.
+```
+[keys]
+dynamic.example.com = 123412341234
+```
+
+Other configuration sections will be ignored.
 
 # Usage
 ```
@@ -31,18 +32,20 @@ usage: he-dyndns [-h] [--v4] [--v6] [--addr4 ADDR4] [--addr6 ADDR6] [--key KEY]
 Update Hurricane Electric DNS dynamic record
 
 positional arguments:
-  record         DNS record to update
+  record             DNS record to update
 
 optional arguments:
-  -h, --help     show this help message and exit
-  --v4           Update IPv4 A record (default)
-  --v6           Update IPv6 AAAA record
-  --addr4 ADDR4  Update A record with provided IP rather than detected IP
-  --addr6 ADDR6  Update AAAA record with provided IP rather than detected IP
-  --key KEY      HE DDNS key for record (by default read from /etc/he-dns-secret)
-  --debug        Enable debug logging
+  -h, --help         show this help message and exit
+  --v4               Update IPv4 A record (default)
+  --v6               Update IPv6 AAAA record
+  --addr4 ADDR4      Update A record with provided IP rather than detected IP
+  --addr6 ADDR6      Update AAAA record with provided IP rather than detected IP
+  --keyfile KEYFILE  Alternate location for key config file (default /etc/he-dns-secret.conf)
+  --key KEY          HE DDNS key for record (by default read from /etc/he-dns-secret.conf or --keyfile)
+  --debug            Enable debug logging
+
 ```
 
 # Return Values
-Returns 0 on success or 1 on failure. Failures also
-include a single line error message.
+Returns 0 on success (successful change or no change) or 1 on failure. 
+Failures also include a single line error message.