Updated FAQ

FAQ.md

@@ -5010,13 +5010,18 @@ Password protected content is encrypted with [AES](https://en.wikipedia.org/wiki
 with a 256 bits key derived with [PBKDF2](https://en.wikipedia.org/wiki/PBKDF2) / [SHA](https://en.wikipedia.org/wiki/Secure_Hash_Algorithms)-512 with 120,000 iterations.
 With a sufficiently long/complex password, which is communicated to the recipient securely, this is considered safe in 2022 and for the foreseeable future.
 
-The maximum content size is 1,500 bytes, which includes [HTML](https://en.wikipedia.org/wiki/HTML) formatting tags.
+Due to [URL](https://en.wikipedia.org/wiki/URL) length limits, the maximum content size is 1,500 bytes,
-Images will be replaced with placeholders to reduce the content size, but other formatting, like bold, italic, etc., will be retained.
+which includes [HTML](https://en.wikipedia.org/wiki/HTML) formatting tags.
+Images will be replaced with placeholders to reduce the content size, but other formatting, like bold, italic, links, etc., will be retained.
+
+The content size limit is also why complete messages (possibly including a long reply chain) cannot be password protected.
+You can use [PGP](https://en.wikipedia.org/wiki/Pretty_Good_Privacy) or [S/MIME](https://en.wikipedia.org/wiki/S/MIME) encryption for this (see [this FAQ](#user-content-faq12)).
+
 [Cross-site scripting](https://en.wikipedia.org/wiki/Cross-site_scripting) is prevented by using [DOMPurify](https://github.com/cure53/DOMPurify) (Apache License Version 2.0).
 
-This feature is available since version 1.1985, but only in the GitHub version of the app.
+Protected content is only available in non-Play Store versions of the app (since version 1.1985).
 
-Sending protected text is a pro feature, decrypting protected text is a free feature.
+Sending protected content is a pro feature, decrypting protected content is a free feature.
 
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