Update README config file setup

README.Rmd

@@ -86,10 +86,12 @@ The vignettes contain setup instructions and example usage:
 
 ### Config File Setup
 
-The `slackr_setup()` function will try to read setup values from a `~/.slackr`
-(you can change the default) configuration file, which may be easier and more
-secure than passing them in manually (plus, will allow you to have multiple
-`slackr` configurations for multiple Slack.com teams).
+The `slackr_setup()` function will try to read setup values from a `~/.slackr` 
+(you can change the default filepath by recording in the SLACKR_CONFIG_FILE 
+environment variable or supplying as an argument to the `config_file` 
+parameter) configuration file, which may be easier and more secure than passing 
+them in manually (plus, will allow you to have multiple `slackr` configurations 
+for multiple Slack.com teams).
 
 The file is in Debian Control File (DCF) format since it really doesn't need to
 be JSON and R has a handy `read.dcf()` function since that's what `DESCRIPTION`

README.md

@@ -87,10 +87,11 @@ roughly the same, with only slightly differing scopes.
 ### Config File Setup
 
 The `slackr_setup()` function will try to read setup values from a
-`~/.slackr` (you can change the default) configuration file, which may
-be easier and more secure than passing them in manually (plus, will
-allow you to have multiple `slackr` configurations for multiple
-Slack.com teams).
+`~/.slackr` (you can change the default filepath by recording in the
+SLACKR_CONFIG_FILE environment variable or supplying as an argument to
+the `config_file` parameter) configuration file, which may be easier and
+more secure than passing them in manually (plus, will allow you to have
+multiple `slackr` configurations for multiple Slack.com teams).
 
 The file is in Debian Control File (DCF) format since it really doesn’t
 need to be JSON and R has a handy `read.dcf()` function since that’s