diff --git a/OpenKeychain/src/main/res/raw/help_faq.html b/OpenKeychain/src/main/res/raw/help_faq.html
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--- a/OpenKeychain/src/main/res/raw/help_faq.html
+++ b/OpenKeychain/src/main/res/raw/help_faq.html
@@ -12,5 +12,13 @@ And don't add newlines before or after p tags because of transifex -->
 <h2>A wrong primary user id is shown when searching on a Keyserver</h2>
 <p>Unfortunately, this is a bug in the SKS Keyserver software. Its machine-readable output returns the user ids in an arbitrary order. Read the <a href="https://bitbucket.org/skskeyserver/sks-keyserver/issue/28/primary-uid-in-machine-readable-index">related bug report</a> for more information.</p>
 
+<h2>How do I activate OpenKeychain in K9-Mail?</h2>
+<p>To use OpenKeychain with K9-Mail, you want to follow these steps:</p>
+<ol>
+    <li>Open K9-Mail and long-tap on the account you want to use OpenKeychain with.</li>
+    <li>Select "Account settings" and scroll to the very bottom and click "Cryptography".</li>
+    <li>Click on "OpenPGP Provider" and select OpenKeychain from the list.</li>
+</ol>
+<p>Thats it.</p>
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 </html>