Add some documentation.

2 files changed, 26 insertions, 0 deletions

diff --git a/doc/markdown/configuration/composites.md b/doc/markdown/configuration/composites.md
index 3aa63c072..09815df25 100644
--- a/doc/markdown/configuration/composites.md
+++ b/doc/markdown/configuration/composites.md
@@ -61,3 +61,14 @@ For example, you have symbol `A` and `B` with weights `W_a` and `W_b` and a comp
 * If `C` is `-A & B`, then rule `A` is preserved, but the symbol `C` is inserted. The weight of `A` is preserved as well, so the total weight of `-A & B` will be `W_a + W_c`.
 * If `C` is `~A & B`, then rule `A` is *removed* but its weight is *preserved*, leading to a single symbol `C` with weight `W_a + W_c`
 
+## Composites with symbol groups
+
+It is also possible to include the whole group of symbols to a composite rule. This
+efficiently means **any** symbol of the specified group:
+
+~~~nginx
+composite {
+    name = "TEST2";
+    expression = "SYMBOL2 && !g:mua";
+}
+~~~
\ No newline at end of file
diff --git a/doc/markdown/modules/maillist.md b/doc/markdown/modules/maillist.md
index e69de29bb..7563eae24 100644
--- a/doc/markdown/modules/maillist.md
+++ b/doc/markdown/modules/maillist.md
@@ -0,0 +1,15 @@
+# Mail list module
+
+Mailing list module is a simple module that performs checks whether a message is
+sent over some popular mailing lists software. This module is designed to negate
+some rules as they are likely to be touched unnecessarily if a message comes from
+some list.
+
+Here is a list of currently supported mailing lists programs:
+
+- Ezmlm
+- Mailman
+- Google groups
+- Majordomo
+- Communigate PRO mailing lists
+- subscribe.ru mailing list 
\ No newline at end of file