diff --git a/go.mod b/go.mod
index b337391..1f8f4fb 100755
--- a/go.mod
+++ b/go.mod
@@ -7,4 +7,5 @@ require (
 	github.com/gizak/termui/v3 v3.1.0
 	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
 	github.com/nsf/termbox-go v0.0.0-20201124104050-ed494de23a00 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
 )
diff --git a/go.sum b/go.sum
index fb4e612..42f7b64 100755
--- a/go.sum
+++ b/go.sum
@@ -37,6 +37,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
diff --git a/main.go b/main.go
index 9be9bc5..b2ae77f 100644
--- a/main.go
+++ b/main.go
@@ -2,10 +2,12 @@ package main
 
 import (
 	"bufio"
-	"flag"
 	"fmt"
 	"log"
 	"os"
+
+	"github.com/alecthomas/chroma/styles"
+	"github.com/spf13/pflag"
 )
 
 // Check is a helper function to error check functions which can be used to error check deferred functions
@@ -34,16 +36,26 @@ func getFileContent(filePath string) []string {
 
 func main() {
 	var filePath string
-	flag.StringVar(&filePath, "f", "", "Parse given file as Makefile")
-	helpFlag := flag.Bool("h", false, "Print this message and exit")
-	allFlag := flag.Bool("a", false, "Display all targets including special built-in targets")
-	flag.Parse()
+	var theme string
+
+	pflag.StringVarP(&filePath, "file-name", "f", "", "Parse given file as Makefile")
+	help := pflag.BoolP("help", "h", false, "Print this message and exit")
+	all := pflag.BoolP("all", "a", false, "Display all targets including special built-in targets")
+	list := pflag.Bool("list-themes", false, "List built-in syntax highlighting themes")
+	pflag.StringVar(&theme, "theme", "vim", "Use a built-in syntax highlighting theme")
+	pflag.Parse()
 
-	if *helpFlag {
+	if *help {
 		// Print help message
 		fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
-		flag.PrintDefaults()
-		os.Exit(1)
+		pflag.PrintDefaults()
+		os.Exit(0)
+	} else if *list {
+		fmt.Println("Built-in themes:")
+		for theme := range styles.Registry {
+			fmt.Println("\t" + theme)
+		}
+		os.Exit(0)
 	} else if filePath == "" {
 		// Attempt to find makefile in current directory
 		defaultMakefileNames := []string{"GNUmakefile", "makefile", "Makefile"}
@@ -57,16 +69,22 @@ func main() {
 			}
 		}
 		if !foundFile {
-			log.Fatal("no Makefile found")
-			os.Exit(1)
+			log.Fatalln("No Makefile found.")
+		}
+	}
+
+	if theme != "" {
+		// Ensure given theme exists in registry.
+		if _, ok := styles.Registry[theme]; !ok {
+			log.Fatalln("\"" + theme + "\" is not a built-in theme.")
 		}
 	}
 
 	content := NewParsedContent(filePath, getFileContent(filePath))
-	if *allFlag {
+	if *all {
 		content.SetIncludeSpecialTargets(true)
 	}
 	content.Parse()
 
-	Render(content)
+	Render(content, theme)
 }
diff --git a/render.go b/render.go
index 6ee4451..d479cc0 100644
--- a/render.go
+++ b/render.go
@@ -11,7 +11,7 @@ import (
 )
 
 // Render sets up and renders widgets to build the user interface
-func Render(content *ParsedContent) {
+func Render(content *ParsedContent, theme string) {
 	if err := ui.Init(); err != nil {
 		log.Fatalf("failed to initialize termui: %v", err)
 	}
@@ -22,7 +22,7 @@ func Render(content *ParsedContent) {
 	target := NewTarget(0, len(content.Rules), content.Rules)
 	target.Rows = getTargets(content.Rules)
 
-	highlighter := NewHighlighter("vim")
+	highlighter := NewHighlighter(theme)
 
 	dependencyWidget := widgets.NewParagraph()
 	dependencyWidget.Title = "Dependencies"