diff --git a/package.json b/package.json
index 477a338..5769e0b 100644
--- a/package.json
+++ b/package.json
@@ -1,11 +1,11 @@
 {
   "name": "paper-computer",
   "scripts": {
-    "rundisplay": "node run-cpu.js run",
-    "rundebug": "node run-cpu.js debug",
-    "asm": "node run-assembler.js run",
-    "asmdebug": "node run-assembler.js debug",
-    "jsdoc": "./node_modules/.bin/jsdoc"
+    "rundisplay": "./run-cpu.js run",
+    "rundebug":   "./run-cpu.js debug",
+    "asm":        "./run-assembler.js run",
+    "asmdebug":   "./run-assembler.js debug",
+    "jsdoc":      "./node_modules/.bin/jsdoc"
   },
   "devDependencies": {
     "jsdoc": "^4.0.2",
diff --git a/run-assembler.js b/run-assembler.js
old mode 100644
new mode 100755
index f1cc371..e48a191
--- a/run-assembler.js
+++ b/run-assembler.js
@@ -1,5 +1,7 @@
-// Run:   `node run-assembler.js run assembly.asm`
-// Debug: `node run-assembler.js debug assembly.asm`
+#!/usr/bin/env node
+
+// Run:   `./run-assembler.js run assembly.asm`
+// Debug: `./run-assembler.js debug assembly.asm`
 
 const fs = require('fs');
 const assembler = require('./assembler.js');
diff --git a/run-cpu.js b/run-cpu.js
old mode 100644
new mode 100755
index 4f50330..74ca22e
--- a/run-cpu.js
+++ b/run-cpu.js
@@ -1,5 +1,7 @@
-// Run:   `node run-cpu.js run assembly.asm`
-// Debug: `node run-cpu.js debug assembly.asm`
+#!/usr/bin/env node
+
+// Run:   `./run-cpu.js run assembly.asm`
+// Debug: `./run-cpu.js debug assembly.asm`
 
 // TODO: allow running pre-compiled machine code.
 //