diff --git a/scripts/bisect-test.ts b/scripts/bisect-test.ts
index 6ad53991462..93a516bc899 100644
--- a/scripts/bisect-test.ts
+++ b/scripts/bisect-test.ts
@@ -3,16 +3,23 @@
 import cp = require('child_process');
 import fs = require('fs');
 
+// Slice off 'node bisect-test.js' from the commandline args
 var args = process.argv.slice(2);
 
+function tsc(tscArgs: string, onExit: (exitCode: number) => void) {
+    var tsc = cp.exec('node built/local/tsc.js ' + tscArgs,() => void 0);
+    tsc.on('close', tscExitCode => {
+        onExit(tscExitCode);
+    });
+}
+
 var jake = cp.exec('jake clean local', () => void 0);
-jake.on('close', code => {
-    if (code === 0) {
+jake.on('close', jakeExitCode => {
+    if (jakeExitCode === 0) {
         // See what we're being asked to do
         if (args[1] === 'compiles' || args[1] === '!compiles') {
-            var tsc = cp.exec('node built/local/tsc.js ' + args[0], () => void 0);
-            tsc.on('close', tscCode => {
-                if ((tscCode === 0) === (args[1] === 'compiles')) {
+            tsc(args[0], tscExitCode => {
+                if ((tscExitCode === 0) === (args[1] === 'compiles')) {
                     console.log('Good');
                     process.exit(0); // Good
                 } else {
@@ -21,8 +28,7 @@ jake.on('close', code => {
                 }
             });
         } else if (args[1] === 'emits' || args[1] === '!emits') {
-            var tsc = cp.exec('node built/local/tsc.js ' + args[0], () => void 0);
-            tsc.on('close', tscCode => {
+            tsc(args[0], tscExitCode => {
                 fs.readFile(args[2], 'utf-8', (err, data) => {
                     var doesContains = data.indexOf(args[3]) >= 0;
                     if (doesContains === (args[1] === 'emits')) {
@@ -38,10 +44,12 @@ jake.on('close', code => {
             console.log('Unknown command line arguments.');
             console.log('Usage (compile errors): git bisect run scripts\bisect.js "foo.ts --module amd" compiles');
             console.log('Usage (emit check): git bisect run scripts\bisect.js bar.ts emits bar.js "_this = this"');
+            // Aborts the 'git bisect run' process
             process.exit(-1);
         }
     } else {
-        // Build failed
+        // Compiler build failed; skip this commit
+        console.log('Skip');
         process.exit(125); // bisect skip
     }
 });