diff --git a/lib/galaxy/config/sample/datatypes_conf.xml.sample b/lib/galaxy/config/sample/datatypes_conf.xml.sample
index 03771c9a233..7c03e7eca0f 100644
--- a/lib/galaxy/config/sample/datatypes_conf.xml.sample
+++ b/lib/galaxy/config/sample/datatypes_conf.xml.sample
@@ -9,6 +9,7 @@
     <datatype extension="source.rs" type="galaxy.datatypes.data:Text" subclass="true" display_in_upload="true" description="Rust source file" />
     <datatype extension="source.cs" type="galaxy.datatypes.data:Text" subclass="true" display_in_upload="true" description="C# source file" />
     <datatype extension="markdown" type="galaxy.datatypes.data:Text" subclass="true" display_in_upload="true" description="Markdown is a lightweight markup language for creating formatted text." description_url="https://commonmark.org"/>
+    <datatype extension="rmd" type="galaxy.datatypes.data:Text" subclass="true" display_in_upload="true" description="R Markdown file combining markdown text with embedded R code chunks." description_url="https://rmarkdown.rstudio.com/"/>
     <datatype extension="hep.root" type="galaxy.datatypes.binary:Binary" subclass="true" display_in_upload="true" description="ROOT binary file."/>
     <datatype extension="jp2" type="galaxy.datatypes.binary:JP2" mimetype="application/octet-stream" display_in_upload="true"/>
     <datatype extension="ab1" type="galaxy.datatypes.binary:Ab1" mimetype="application/octet-stream" display_in_upload="true" description="A binary sequence file in 'ab1' format with a '.ab1' file extension.  You must manually select this 'File Format' when uploading the file." description_url="https://wiki.galaxyproject.org/Learn/Datatypes#Ab1"/>