diff --git a/lib/strings.nix b/lib/strings.nix
index 0b58caf..2a3ec77 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -2,5 +2,8 @@
 let
 in
 {
-  # FIXME
+  # Make an email address from the name and domain stems
+  #
+  # mkMailAddress :: String -> String -> String
+  mkMailAddress = name: domain: "${name}@${domain}";
 }