diff --git a/articles/guides/GPG/GPG.html.md b/articles/guides/GPG/GPG.html.md
index a1100f3..62de8c2 100644
--- a/articles/guides/GPG/GPG.html.md
+++ b/articles/guides/GPG/GPG.html.md
@@ -176,9 +176,21 @@ By the way, you can find my gpg.conf [here].
#### Group lines
-Write this later.
+Group lines are a way to write email to one recepient and have it encrypted to multiple keys automatically.
-See also my Enigmail instructions about group lines.
+Example group line:
+
+> group =82A46728 8449A12B 666CC0DD 4EC00206
+
+With that line, when recepient is touchlay-server@googlegroups.com, then emails are encrypted to those 4 keys.
+
+NOTE: I think that group lines require email addresses to be in format
+
+>
+
+See also my [Enigmail] instructions about group lines.
+
+[Enigmail]:Enigmail.html
### Comments