diff --git a/EGroupware-Customizing.md b/EGroupware-Customizing.md
index 8f2b784..6a24490 100644
--- a/EGroupware-Customizing.md
+++ b/EGroupware-Customizing.md
@@ -78,7 +78,7 @@ With option "maxlength=2000" the allowed text length can be specified, so the us
 * "Serial number" can be used to automatically generate a number, starting from option "last" and optional using a filter criteria like "info_status=archived" or "invoiced", which sets the number only, if that status is set. See example below right side.
 ![Admin - custom fields - left: upload - right: serial number](https://www.egroupware.org/wp-content/uploads/custom-upload-serial-number.png)
 
-## Custom-eTemplates
+## Custom-etemplates
 * This is NOT meant as a full introduction or manual for eTemplate usage, it's just a rough overview, especially about the modification with custom fields.
 * **Reference for widgets** (a full documentation is planned, but not yet done!): https://etemplate.egroupware.org/ 
 Additionally there is a dtd-file specified in the xet-files it self, which contains lots of specifications and attributes. The dtd can be read from typical developer tools like PhpStorm.