Document default modules

Closes #2133

diff --git a/docs/markdown/appendix/compiling-powerdns.md b/docs/markdown/appendix/compiling-powerdns.md
index fd58ada7c675e25839b68ed441278f0017ab32cf..2bdb0f6a212a22fa00581a278b0140f1e4814cee 100644 (file)
--- a/docs/markdown/appendix/compiling-powerdns.md
+++ b/docs/markdown/appendix/compiling-powerdns.md
@@ -14,6 +14,11 @@ To compile a module for inclusion at runtime, which is great if you are a unix
 vendor, use `--with-dynmodules='mod1 mod2 mod3'`. These modules then end up as
 .so files in the compiled libdir.
 
+By default, the [bind](../authoritative/backend-bind.md), [mysql](../authoritative/backend-generic-mysql.md)
+and [random](../authoritative/backend-random.md) are compiled into the binary.
+The [pipe](../authoritative/backend-pipe.md) is, by default, compiled as a runtime
+loadable module.
+
 ## Getting the sources
 There are 3 ways of getting the source. If you want the bleeding edge, you can
 clone the repository at [GitHub](https://github.com/PowerDNS/pdns) and run