diff --git a/src/assembler.js b/src/assembler.js
old mode 100644
new mode 100755
index d476ad1..2b20ffc
--- a/src/assembler.js
+++ b/src/assembler.js
@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 const fs = require('fs');
 
 const { logMemory, num2hex } = require('./logging.js');
diff --git a/src/cardiograph.js b/src/cardiograph.js
old mode 100644
new mode 100755
index 931c8d2..8c51bbe
--- a/src/cardiograph.js
+++ b/src/cardiograph.js
@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 const DBG = require('./dbg.js');
 const { num2hex, bool2bit } = require('./logging.js');