diff --git a/engineering-guide/accounts-and-groups.md b/engineering-guide/accounts-and-groups.md
index c7133883..07bba09d 100644
--- a/engineering-guide/accounts-and-groups.md
+++ b/engineering-guide/accounts-and-groups.md
@@ -77,7 +77,7 @@ Finally the [gecos field](https://en.wikipedia.org/wiki/Gecos_field) shall be ge
 
 example:
 ```
-Konrad Bucheli,OBBA/230,telephoneNumber,,konrad.bucheli@psi.ch
+Konrad Bucheli,OBBA/230,+41563102724,,konrad.bucheli@psi.ch
 ```
 Note the field 4 (home/mobile number) we do not set, thus we have an empty field with two commas in a row.