Expanded configuration section in readme

README.md

@@ -42,8 +42,31 @@ By default, SNS will set itself up in `~/.config/sns`, with `~/.config/sns/sns.c
 as its configuration file.
 
 ## Configuration
-In SNS's configuration file, you can change the editor SNS uses, along with
-the date format used in notes, and whether or not to use GPG encryption.
+In the configuration file, `~/.config/sns/sns.conf` you can change the following
+properties of SNS:
+
+* The file extension to use for notes
+
+    The default is `.note`, however you might change it to `.md` for editor autodetection.
+
+* The editor SNS calls
+
+    SNS will refuse to run if $EDITOR isn't specified by the environment, however you can
+    set an editor here separate from the environment-specified one.
+
+* Date Format
+
+    SNS adds date and time to notes and edits by default. Clearing this should
+    remove the date/time line by default, but you can also change it to any
+    string the `date` command will accept as a format.
+
+* Encryption
+
+    This is SNS's main encryption toggle. It must be on for encryption to function.
+
+* Public Key
+
+    SNS requires the identifier of a GPG public key for encryption to function.
 
 **A word about encryption**: Enabling encryption will cause problems if
 previously un-encrypted notes exist. In the future, I'd like to resolve these,