diff --git a/docs/source/oclapi/apireference/concepts.md b/docs/source/oclapi/apireference/concepts.md
index 34a0273..69adc93 100644
--- a/docs/source/oclapi/apireference/concepts.md
+++ b/docs/source/oclapi/apireference/concepts.md
@@ -582,6 +582,20 @@ Status: 200 OK
 
 
 
+## List parents or children of a concept
+* List the concepts that are the parents, or the children, of a concept in its source's hierarchy, where an optional `:sourceVersion` is a source version ID
+```
+GET /orgs/:org/sources/:source/[:sourceVersion/]concepts/:concept/parents/
+GET /orgs/:org/sources/:source/[:sourceVersion/]concepts/:concept/children/
+GET /users/:user/sources/:source/[:sourceVersion/]concepts/:concept/parents/
+GET /users/:user/sources/:source/[:sourceVersion/]concepts/:concept/children/
+GET /user/sources/:source/[:sourceVersion/]concepts/:concept/parents/
+GET /user/sources/:source/[:sourceVersion/]concepts/:concept/children/
+```
+* Notes
+    * Only concepts the requester can view are listed: a parent or child in another source is listed only if the requester can view that source.
+    * These lists aren't searchable: `q` and other search parameters are ignored. To search a source's concepts, use [List concepts in a source](#list-concepts-in-a-source).
+
 ## Get a single concept name
 * Get a single concept name
 ```
diff --git a/docs/source/oclapi/apireference/orgs.md b/docs/source/oclapi/apireference/orgs.md
index f580731..eeecc1a 100644
--- a/docs/source/oclapi/apireference/orgs.md
+++ b/docs/source/oclapi/apireference/orgs.md
@@ -86,7 +86,7 @@ GET /user/orgs/
 POST /orgs/
 ```
 * Input
-    * **id** (required) string
+    * **id** (required) string - unique regardless of letter case: an id that differs from an existing organization's only in case (e.g. `my-org` when `My-Org` exists) returns `400 Bad Request`
     * **name** (required) string
     * **company** (optional) string
     * **website** (optional) string