diff --git a/docs/schema/codelists.md b/docs/schema/codelists.md
index 776c030e5..738d27fcc 100644
--- a/docs/schema/codelists.md
+++ b/docs/schema/codelists.md
@@ -22,6 +22,8 @@ Codes are case-sensitive, and are generally provided as English language camelCa
 
 A contracting process can result in a number of releases of information over time. These must be tagged to indicate the stage of the contracting process they relate to.
 
+Additional codes may be used to label releases, based on user needs: for example, to indicate the notice or form to which a release corresponds.
+
 ```{csv-table-no-translate}
 :header-rows: 1
 :widths: auto
diff --git a/requirements.txt b/requirements.txt
index 2c8eaff33..f25c4db92 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,6 @@
 # Add your own requirements below.
 
 linkify-it-py
-sphinxcontrib-opencontracting==0.0.1
--e git+https://github.com/OpenDataServices/sphinxcontrib-jsonschema.git@75e4427b0f6f6a23dff9019aeb5d64833aab104a#egg=sphinxcontrib-jsonschema
--e git+https://github.com/OpenDataServices/sphinxcontrib-opendataservices.git@fab0ff0167d32ec243d42f272e0e50766299c078#egg=sphinxcontrib-opendataservices
+sphinxcontrib-opencontracting==0.0.3
+sphinxcontrib-opendataservices-jsonschema==0.2.0
+sphinxcontrib-opendataservices==0.1.0
diff --git a/schema/dereferenced-release-schema.json b/schema/dereferenced-release-schema.json
index eaae41a71..7c3d93219 100644
--- a/schema/dereferenced-release-schema.json
+++ b/schema/dereferenced-release-schema.json
@@ -27,7 +27,7 @@
     },
     "tag": {
       "title": "Release Tag",
-      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. Tags can be used to filter releases and to understand the kind of information that releases might contain.",
+      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. A tag labels the release: for example, as corresponding to a particular stage of the contracting process. Codes outside the releaseTag codelist might indicate, for example, the notice or form to which the release corresponds, or the event that triggered the publication of the release.",
       "type": "array",
       "items": {
         "type": "string"
diff --git a/schema/release-schema.json b/schema/release-schema.json
index 04e44d60f..0ed4d90d9 100644
--- a/schema/release-schema.json
+++ b/schema/release-schema.json
@@ -27,7 +27,7 @@
     },
     "tag": {
       "title": "Release Tag",
-      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. Tags can be used to filter releases and to understand the kind of information that releases might contain.",
+      "description": "One or more values from the open [releaseTag](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/codelists/#release-tag) codelist. A tag labels the release: for example, as corresponding to a particular stage of the contracting process. Codes outside the releaseTag codelist might indicate, for example, the notice or form to which the release corresponds, or the event that triggered the publication of the release.",
       "type": "array",
       "items": {
         "type": "string"