diff --git a/README.md b/README.md
index 14bf94e..7850658 100644
--- a/README.md
+++ b/README.md
@@ -20,14 +20,14 @@ Populate the `custom-format.formatters` setting.
 	// Create our custom formatters
 	"custom-format.formatters": [
 		{
-			// Whatever language id you need to format
-			"language": "javascript",
+			// Whatever language id you need to format - or a list of languages
+			"language": ["javascript", "typescript"],
 			// The command that will be run to format files with the language id specified above
 			"command": "node format.js $FILE" // $FILE is replaced with the path of the file to be formatted
 		},
 		{
-			"language": "typescript",
-			"command": "node format-ts.js"
+			"language": "html",
+			"command": "node format-html.js"
 		}
 	],
 
@@ -53,9 +53,10 @@ If there is no content written to `stdout`, error or no error, the formatting of
 
 If the command exits with a non-zero code, the formatting of the file will be skipped.
 
-Commands are executed in a subshell, not spawned directly.
+Commands are executed in a subshell, not spawned directly, and are provided with the following environment variables:
 
-Commands are provided with the environment variable, `FILE`, which is the absolute path to the file that is being formatted.
+* `FILE`, which is the absolute path to the file that is being formatted.
+* `FILETYPE`, which is the file type (language) as seen by the editor.
 
 Although it is possible to read from and write to `$FILE` directly, it is better to read from `stdin` and write to `stdout` because it mutates the editor state, not the filesystem state, which could differ.
 
diff --git a/src/extension.ts b/src/extension.ts
index be8df42..6005bab 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -7,7 +7,7 @@ import { runCommand } from './run-command'
 
 interface Formatter {
 	command: string
-	language: string
+	language: string | string[]
 }
 
 export function activate(context: ExtensionContext) {
@@ -42,27 +42,32 @@ export function activate(context: ExtensionContext) {
 				break
 			}
 
-			let disposable = languages.registerDocumentFormattingEditProvider(formatter.language, {
-				async provideDocumentFormattingEdits(document: TextDocument): Promise<TextEdit[]> {
-					const rawText = document.getText()
-					const filename = document.uri.fsPath
-					const workspaceDir = getCwd(filename)
-					const formattedText = await runCommand(rawText, formatter.command, filename, workspaceDir)
+			const languages = Array.isArray(formatter.language) ? formatter.language : [formatter.language]
 
-					const lastLineNumber = document.lineCount - 1
-					const lastLineChar = document.lineAt(lastLineNumber).text.length
+			for (let language of languages) {
+				let disposable = languages.registerDocumentFormattingEditProvider(language, {
+					async provideDocumentFormattingEdits(document: TextDocument): Promise<TextEdit[]> {
+						const rawText = document.getText()
+						const filename = document.uri.fsPath
+						const filetype = document.languageId
+						const workspaceDir = getCwd(filename)
+						const formattedText = await runCommand(rawText, formatter.command, filename, filetype, workspaceDir)
 
-					const startPos = new Position(0, 0)
-					const endPos = new Position(lastLineNumber, lastLineChar)
-					const replaceRange = new Range(startPos, endPos)
+						const lastLineNumber = document.lineCount - 1
+						const lastLineChar = document.lineAt(lastLineNumber).text.length
 
-					return [TextEdit.replace(replaceRange, formattedText)]
-				},
-			})
+						const startPos = new Position(0, 0)
+						const endPos = new Position(lastLineNumber, lastLineChar)
+						const replaceRange = new Range(startPos, endPos)
 
-			listeningLanguages.push(formatter.language)
+						return [TextEdit.replace(replaceRange, formattedText)]
+					},
+				})
 
-			context.subscriptions.push(disposable)
+				listeningLanguages.push(language)
+
+				context.subscriptions.push(disposable)
+			}
 		}
 
 		log(`Formatting activated for the following languages: [${listeningLanguages.toLocaleString()}]`)
diff --git a/src/run-command.ts b/src/run-command.ts
index 73888ca..95f8c5e 100644
--- a/src/run-command.ts
+++ b/src/run-command.ts
@@ -12,12 +12,13 @@ function stripColor(input: string): string {
 	return input.replace(regex, '')
 }
 
-export async function runCommand(text: string, command: string, filename: string, workspacePath: string): Promise<string> {
-	const args = command.replace(/\$FILE/g, filename).split(' ')
-	const file = args.shift()
-
-	if (!file) return text
-
+export async function runCommand(
+	text: string,
+	command: string,
+	filename: string,
+	filetype: string,
+	workspacePath: string
+): Promise<string> {
 	const errorOut = (error: string) => {
 		logError(`Received an error while formatting ${filename}:\n> ${command}\nError:\n> ${error.replace(/\n/g, '\n> ')}`)
 	}
@@ -31,7 +32,7 @@ export async function runCommand(text: string, command: string, filename: string
 
 			const child = childProcess.exec(
 				command,
-				{ cwd: workspacePath, env: { ...process.env, FILE: filename }, shell: process.env.SHELL },
+				{ cwd: workspacePath, env: { ...process.env, FILE: filename, FILETYPE: filetype }, shell: process.env.SHELL },
 				(error, stdout, stderr) => {
 					if (error) {
 						if (!didReject) reject(error)