diff --git a/Developers-notes.md b/Developers-notes.md
index 5c1ed19..b1ca040 100644
--- a/Developers-notes.md
+++ b/Developers-notes.md
@@ -10,4 +10,8 @@ https://www.impressivewebs.com/loading-different-jquery-version-ie6-8/
 
 ## Regular Expressions
 
-* [Test Regular Expressions Online](https://www.debuggex.com/)
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+* [Test Regular Expressions Online](https://www.debuggex.com/)
+
+## Security
+
+* https://nameconstraints.bettertls.com/#!view?results=python_2.7.13_linux
\ No newline at end of file