diff --git a/README.md b/README.md
index e8ac50c..c3cd53d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
-This is a very simple, but cryptographically decent, password generator.
+This is a very simple,
+but cryptographically not awful,
+password generator.
 
 Click on the extension icon, and it makes a password of length 12.
 You can dial the length up or down and tell it not to include certain character classes,
@@ -9,6 +11,19 @@ So when you need a password,
 typically you can click the extension,
 then go back to the form and paste in your new password.
 
-![Screenshot](res/Screenshot from 2017-03-12 19-19-52.png)
+![Screenshot](res/screenshot.jpg)
 
-Hooray!
\ No newline at end of file
+Hooray!
+
+
+Cryptographically Not Awful
+---------------------------
+
+There are password generators that go to great lengths to use
+high-entropy seeds for their random number generators.
+This one uses `window.crypto.getRandomValues`,
+which is good enough for my purposes.
+You'll have to decide if it's good enough for yours.
+Feel free to
+[read the code](js/popup.js)
+and decide for yourself.
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