diff --git a/misp-galaxy-format/raw.md b/misp-galaxy-format/raw.md
index 66d170d..a6b0a42 100644
--- a/misp-galaxy-format/raw.md
+++ b/misp-galaxy-format/raw.md
@@ -92,7 +92,7 @@ The uuid represents the Universally Unique IDentifier (UUID) [@!RFC4122] of the
 
 ## related
 
-Related contains a list of JSON key value pairs which describe the related values in this galaxy cluster or to other galaxy clusters. The JSON object contains three fields, dest-uuid, type and tags. The dest-uuid represents the target UUID which encompasses a relation of some type. The dest-uuid is represented as a string and **MUST** be present. The type is represented as a string and **MUST** be present. The tags is a list of string which labels the related relationship such as the level of similarities, level of certainty, trust or confidence in the relationship, false-positive . A tag is represented in machine tag format which is a string an **SHOULD** be present.
+Related contains a list of JSON key value pairs which describe the related values in this galaxy cluster or to other galaxy clusters. The JSON object contains three fields, dest-uuid, type and tags. The dest-uuid represents the target UUID which encompasses a relation of some type. The dest-uuid is represented as a string and **MUST** be present. The type is represented as a string and **MUST** be present and **SHOULD** be selected from the relationship types available in MISP objects [@?MISP-R].  The tags is a list of string which labels the related relationship such as the level of similarities, level of certainty, trust or confidence in the relationship, false-positive. A tag is represented in machine tag format which is a string an **SHOULD** be present.
 
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 "related": [ {