diff --git a/fixture/fixture.dsf b/fixture/fixture.dsf
new file mode 100644
index 00000000..80024278
Binary files /dev/null and b/fixture/fixture.dsf differ
diff --git a/index.d.ts b/index.d.ts
index c7b6c2ba..45dc3862 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -94,7 +94,8 @@ declare namespace fileType {
 		| 'mpc'
 		| 'ics'
 		| 'glb'
-		| 'pcap';
+		| 'pcap'
+		| 'dsf';
 
 	interface FileTypeResult {
 		/**
diff --git a/index.js b/index.js
index cf744b3a..ba366c00 100644
--- a/index.js
+++ b/index.js
@@ -920,6 +920,14 @@ const fileType = input => {
 		};
 	}
 
+	// Sony DSD Stream File (DSF)
+	if (check([0x44, 0x53, 0x44, 0x20])) {
+		return {
+			ext: 'dsf',
+			mime: 'audio/x-dsf' // Non-standard
+		};
+	}
+
 	return null;
 };
 
diff --git a/package.json b/package.json
index f2a78f41..95541413 100644
--- a/package.json
+++ b/package.json
@@ -118,7 +118,8 @@
 		"wma",
 		"ics",
 		"glb",
-		"pcap"
+		"pcap",
+		"dsf"
 	],
 	"devDependencies": {
 		"@types/node": "^11.12.2",
diff --git a/readme.md b/readme.md
index ef989cb5..bab055ba 100644
--- a/readme.md
+++ b/readme.md
@@ -216,6 +216,7 @@ Type: [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream
 - [`ics`](https://en.wikipedia.org/wiki/ICalendar#Data_format) - iCalendar
 - [`glb`](https://github.com/KhronosGroup/glTF) - GL Transmission Format
 - [`pcap`](https://wiki.wireshark.org/Development/LibpcapFileFormat) - Libpcap File Format
+- [`dsf`](https://dsd-guide.com/sites/default/files/white-papers/DSFFileFormatSpec_E.pdf) - Sony DSD Stream File (DSF)
 
 *SVG isn't included as it requires the whole file to be read, but you can get it [here](https://github.com/sindresorhus/is-svg).*
 
diff --git a/test.js b/test.js
index 7efe5588..0a65416a 100644
--- a/test.js
+++ b/test.js
@@ -104,7 +104,8 @@ const types = [
 	'dcm',
 	'ics',
 	'glb',
-	'pcap'
+	'pcap',
+	'dsf'
 ];
 
 // Define an entry here only if the fixture has a different