diff --git a/content/concepts/terminology.md b/content/concepts/terminology.md
index 194077b8..2bcf3d49 100644
--- a/content/concepts/terminology.md
+++ b/content/concepts/terminology.md
@@ -27,6 +27,16 @@ Someone who wants assets. An example is a data scientist working at an economic
 
 A service where publishers can list what assets they have, and consumers can see what's available then buy it (or get it for free). The Ocean network supports many marketplaces/tribes.
 
+## Verifier
+
+A person or a software service that checks some steps in transactions. For example, a verifier might check to see if a cryptographic signature is valid and then get rewarded for doing so.
+
+## Service Execution Agreement (SEA)
+
+A contract-like agreement between a provider, a consumer, and a verifier, specifying what data assets are to be delivered (from provider to consumer), the conditions that must be met, and the rewards for fulfilling the conditions.
+
+We published an [Ocean Protocol blog post that explains SEAs in more detail](https://blog.oceanprotocol.com/exploring-the-sea-service-execution-agreements-65f7523d85e2).
+
 ## More Terminology
 
 See the page about Ocean's [Software Components](/concepts/components/).