diff --git a/doc/comedilib.ent b/doc/comedilib.ent
new file mode 100644
index 0000000..55ae62f
--- /dev/null
+++ b/doc/comedilib.ent
@@ -0,0 +1,3 @@
+<!ENTITY comedi "<acronym>Comedi</acronym>">
+<!ENTITY uuml "ue">
+<!ENTITY hellip "...">