Add link to controlled vocab example

content/editor/edit/fields/_index.en.md

@@ -153,7 +153,7 @@ See Darwin Core's <a href="http://rs.tdwg.org/dwc/terms/minimumDepthInMeters" ta
 
 {{< dwc-term id="samplingProtocol" verbatim="Sampling Protocol" descr="The names and references to methods used to collect or sample an occurrence" ex="UV light trap, mist net, Takats et al. 2001. Guidelines for Nocturnal Owl Monitoring in North America. Beaverhill Bird Observatory and Bird Studies Canada, Edmonton, Alberta. 32 pp., http://www.bsc-eoc.org/download/Owl.pdf" dwc="samplingProtocol" >}}
 
-{{< dwc-term id="preparations" verbatim="Preparations" descr="Preparation or preservation method for a specimen" ex="in ethanol, skeleton" dwc="preparations" >}}
+{{< dwc-term id="preparations" verbatim="Preparations" descr="Preparation or preservation method for a specimen. While no controlled vocabulary currently exists for this field, a reasonable attempt can be found [here](https://github.com/tdwg/cd/issues/64#issuecomment-781653290)." ex="in ethanol, skeleton" dwc="preparations" >}}
 
 {{< dwc-term id="reproductiveCondition" verbatim="Phenology (Reproductive Condition)" descr="The reproductive stage the specimen is in. Typically used for plant and fungal collections." ex="flower, fruit, sterile" dwc="reproductiveCondition" >}}