diff --git a/types/slackdown/index.d.ts b/types/slackdown/index.d.ts
new file mode 100644
index 0000000000..4086de7bf9
--- /dev/null
+++ b/types/slackdown/index.d.ts
@@ -0,0 +1,6 @@
+// Type definitions for slackdown 0.1
+// Project: https://github.com/blockmar/slackdown
+// Definitions by: nju33 <https://github.com/nju33>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function parse(text: string): string;
diff --git a/types/slackdown/slackdown-tests.ts b/types/slackdown/slackdown-tests.ts
new file mode 100644
index 0000000000..f04e88a218
--- /dev/null
+++ b/types/slackdown/slackdown-tests.ts
@@ -0,0 +1,3 @@
+import * as slackdown from 'slackdown';
+
+slackdown.parse('xxx <http://xxxxx.jp|xxxxx.jp>');
diff --git a/types/slackdown/tsconfig.json b/types/slackdown/tsconfig.json
new file mode 100644
index 0000000000..0e630d9279
--- /dev/null
+++ b/types/slackdown/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "slackdown-tests.ts"
+    ]
+}
diff --git a/types/slackdown/tslint.json b/types/slackdown/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/slackdown/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }