diff --git a/4_Privacy_And_Security_Links.md b/4_Privacy_And_Security_Links.md
index e499fc9..58c9924 100644
--- a/4_Privacy_And_Security_Links.md
+++ b/4_Privacy_And_Security_Links.md
@@ -67,6 +67,8 @@
   - Improving security on iPhone: via [lifehacker](https://lifehacker.com/the-privacy-enthusiasts-guide-to-using-an-iphone-1792386831)
 - **Software**
   - How to use Vera Crypt: via [howtogeek](https://www.howtogeek.com/108501/the-how-to-geek-guide-to-getting-started-with-truecrypt)
+- **Physical Security**
+  - Hiding from Physical Surveillance: via [Snallabolaget](http://snallabolaget.com/hiding-from-surveillance-how-and-why)
 
 ## Notable Articles