diff --git a/README.md b/README.md
index 2e1e0cd..a9b0633 100644
--- a/README.md
+++ b/README.md
@@ -10,20 +10,28 @@ To run this, you'll need Go installed. With that, you can compile the project:
 go get github.com/writeas/text-pic/cmd/wfgraphic-cli
 ```
 
-Then you can run `wfgraphic-cli` with the options below. The actual content of the graphic is read from `stdin`, which you can either supply when prompted to, or pipe in (e.g. `cat quote.txt | ./wfgraphic-cli`).
+Then you can run `wfgraphic-cli` with the options below.
 
 ```
 Usage of wfgraphic-cli:
   -font string
         Post font (options: "serif", "sans", "mono") (default "serif")
   -i string
-        WriteFreely instance hostname (e.g. pencil.writefree.ly) (default "write.as")
+        WriteFreely instance hostname (e.g. "pencil.writefree.ly")
   -o string
         Image output filename (default "out.png")
+  -size string
+        Image size, either a single number for a square (e.g. "900") or a combined width and height (e.g. "1080x1920") (default "1024")
   -u string
         WriteFreely author username (for multi-user instances)
 ```
 
+The actual content of the graphic is read from `stdin`, which you can either supply when prompted to, or pipe in, for example:
+
+```
+cat quote.txt | ./wfgraphic-cli -i write.as -u blog
+```
+
 ## Examples
 
 <table>
diff --git a/cmd/wfgraphic-cli/main.go b/cmd/wfgraphic-cli/main.go
index a06d239..3f04ac1 100644
--- a/cmd/wfgraphic-cli/main.go
+++ b/cmd/wfgraphic-cli/main.go
@@ -25,7 +25,7 @@ import (
 var (
 	outputFile = flag.String("o", "out.png", "Image output filename")
 	font       = flag.String("font", "serif", "Post font (options: \"serif\", \"sans\", \"mono\")")
-	instance   = flag.String("i", "write.as", "WriteFreely instance hostname (e.g. \"pencil.writefree.ly\")")
+	instance   = flag.String("i", "", "WriteFreely instance hostname (e.g. \"pencil.writefree.ly\")")
 	author     = flag.String("u", "", "WriteFreely author username (for multi-user instances)")
 	size       = flag.String("size", "1024", "Image size, either a single number for a square (e.g. \"900\") or a combined width and height (e.g. \"1080x1920\")")
 )
@@ -35,6 +35,11 @@ func main() {
 	flag.Parse()
 
 	// Validate input
+	if *instance == "" {
+		log.Info("Aborting. Instance name (-i instance.tld) is required")
+		flag.Usage()
+		os.Exit(1)
+	}
 	if !textpic.IsValidFont(*font) {
 		log.Info("Invalid --font given. Options: \"serif\", \"sans\", \"mono\"")
 		os.Exit(1)
diff --git a/options.go b/options.go
index 0459cfe..6d6da64 100644
--- a/options.go
+++ b/options.go
@@ -39,9 +39,6 @@ func NewContentOptions(instance, username string, isSubdomain bool, font, conten
 		UserFont:    font,
 		Content:     content,
 	}
-	if opt.Instance == "" {
-		opt.Instance = "write.as"
-	}
 	if opt.Content == "" {
 		opt.Content = "Hello, world!"
 	}