diff --git a/doc/materials/groups/MATGROUP_ACIDIC b/doc/materials/groups/MATGROUP_ACIDIC
new file mode 100644
index 0000000..bcfb8e7
--- /dev/null
+++ b/doc/materials/groups/MATGROUP_ACIDIC
@@ -0,0 +1,5 @@
+Gruppenid:
+MATGROUP_ACIDIC
+
+Name:
+Saeuren