By default, the mod provides descriptions for all Vanilla Minecraft enchantments as well, and uses a similar format to entities. To add a tooltip to an enchantment, just add the following entry to your mod or resource pack's language file (en_us.json for English U.S.).

"enchantment.<namespace>.<your_enchantment_here>.description": "An enchanment that cause strange, modded things to happen."

For example, if I wanted to add a description to agile from Enchiridon, I would add the following entry to Enchiridon's language file.

"enchantment.enchiridion.agile.description": "An enchantment that allows the user to sprint at a reduced speed whilst using items.",

When adding new tooltips, its recommended to keep them two sentences or less to match the ones present in the original mod.

Fallback Behaviour

For compatibility purpose, Item Descriptions will fall back to descriptions designed for the standalone Enhancement Descriptions mod, if a more accurate description is not present. For example, the following description would be shown through Item Descriptions if Enchantment Descriptions is not present.

"enchantment.enchiridion.agile.desc": "Allows the user to sprint at a reduced speed whilst using items.",