Another documentation contributor.
diff --git a/Doc/ACKS b/Doc/ACKS
index 31bec41..c23c3da 100644
--- a/Doc/ACKS
+++ b/Doc/ACKS
@@ -65,6 +65,7 @@
 Mark Hammond
 Harald Hanche-Olsen
 Manus Hand
+Gerhard Häring
 Travis B. Hartwell
 Janko Hauser
 Bernhard Herzog