diff --git a/readme.md b/readme.md
index abef2a0..488e752 100644
--- a/readme.md
+++ b/readme.md
@@ -35,7 +35,7 @@ Here's what to do if you haven't already set up your `GOPATH`:
    variables:
 
    ```shell
-   $ export SMSBB_ACCT_ID="..." # Your Twilio Account SID goes here
+   $ export SMSBB_ACCT_SID="..." # Your Twilio Account SID goes here
    $ export SMSBB_AUTH_TOKEN="..." # Your Twilio Auth Token goes here
    ```
 
diff --git a/smsbb.go b/smsbb.go
index d086f14..5c8f062 100644
--- a/smsbb.go
+++ b/smsbb.go
@@ -11,11 +11,11 @@ import (
 )
 
 func main () {
-	accountSid := os.Getenv("SMSBB_ACCT_ID")
+	accountSid := os.Getenv("SMSBB_ACCT_SID")
 	authToken := os.Getenv("SMSBB_AUTH_TOKEN")
 
 	if (len(accountSid) == 0) {
-		fmt.Fprintf(os.Stderr, "Please set the SMSBB_ACCT_ID environment variable to your Twilio account ID\n")
+		fmt.Fprintf(os.Stderr, "Please set the SMSBB_ACCT_SID environment variable to your Twilio account SID\n")
 		os.Exit(1)
 	}