diff --git a/README.md b/README.md
index a34cf00..a455c44 100644
--- a/README.md
+++ b/README.md
@@ -5,4 +5,8 @@ Xenforo2 anti-spam extension.
 ## How to install
 
 1) Copy CleanTalk folder to your <xenforo root directory>/src/Addons
-2) Go to ACP->Addons->Install
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+2) Go to ACP->Addons->Install
+
+## Requirements
+
+* CleanTalk account https://cleantalk.org/register?product=anti-spam
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