diff --git a/advanced_expert/bug_hunting/README.md b/advanced_expert/bug_hunting/README.md
index 1cab630..0f78c39 100644
--- a/advanced_expert/bug_hunting/README.md
+++ b/advanced_expert/bug_hunting/README.md
@@ -38,9 +38,21 @@
 <br>
 
 * **[solidity bugs by version](https://00xsev.github.io/solidityBugsByVersion/)**
+
+<br>
+
+#### cool bug bounty platforms
+
 * **[immunefi](https://immunefi.com/)**
 * **[hackenproof](https://hackenproof.com/)**
 * **[bountycaster](https://www.bountycaster.xyz/)**
 * **[certik](https://www.certik.com/products/bug-bounty)**
 * **[remedy](https://r.xyz/)**
-  
+
+<br>
+
+#### cool communities
+
+* **[eth rangers](https://ethrangers.com/)**
+* **[security alliance](https://securityalliance.org/)**
+* **[the red guild](https://theredguild.org/)**