diff --git a/CHANGELOG.md b/CHANGELOG.md
index e407269..f1a53e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ represented by the pull requests that fixed them. Critical items to know are:
 Versions correspond with GitHub releases that can be referenced with @ using actions.
 
 ## [master](https://github.com/vsoch/pull-request-action/tree/master) (master)
+  - forgot to add assignees (1.0.15)
   - output and environment variables for PR number and return codes (1.0.5)
   - added support for reviewer (individual and team) assignments (1.0.4)
   - added support for maintainer can modify and assignees (1.0.3)
diff --git a/README.md b/README.md
index 2a379fe..90c73ed 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,8 @@ Unlike standard actions, this action just uses variables from the environment.
 | PULL_REQUEST_TEAM_REVIEWERS | A list (string with spaces) of teams to assign review | false | unset |
 | PASS_ON_ERROR | Instead of failing on an error response, pass | unset |
 | PASS_IF_EXISTS | Instead of failing if the pull request already exists, pass | unset |
+| PULL_REQUEST_UPDATE | If the pull request already exists, update it | unset |
+| PULL_REQUEST_STATE | If `PULL_REQUEST_UPDATE` is true, update to this state (open, closed) | open |
 
 For `PULL_REQUEST_DRAFT`, `PASS_ON_ERROR`, `PASS_IF_EXISTS`, and `MAINTAINER_CANT_MODIFY`, these are
 treated as environment booleans. If they are defined in the environment, they trigger the
@@ -56,6 +58,7 @@ treated as environment booleans. If they are defined in the environment, they tr
  - Define `PULL_REQUEST_DRAFT` if you want the PR to be a draft.
  - Define `PASS_ON_ERROR` if you want the PR to not exit given any non 200/201 response.
  - Define `PASS_IF_EXISTS` if you want the PR to not exit given the pull request is already open.
+ - Define `PULL_REQUEST_UPDATE` if you want the pull request to be updated if it already exits.
 
 For `PULL_REQUEST_ASSIGNEES`, `PULL_REQUEST_REVIEWERS`, and `PULL_REQUEST_TEAM_REVIEWERS` 
 you can provide a string of one or more GitHub usernames (or team names) to
diff --git a/pull-request.py b/pull-request.py
index 8c6c463..ac352c0 100755
--- a/pull-request.py
+++ b/pull-request.py
@@ -188,11 +188,12 @@ def list_pull_requests(target, source):
     return response.json()
 
 
-def add_assignees(entry):
+def add_assignees(entry, assignees):
     """Given a pull request metadata (from create or update) add assignees
 
     Parameters:
-    entry (dict) : the pull request metadata
+    entry (dict)    : the pull request metadata
+    assignees (str) : comma separated assignees string set by action
     """
     # Remove leading and trailing quotes
     assignees = parse_into_list(assignees)
@@ -320,7 +321,7 @@ def create_pull_request(
 
     # If we have opened or updated, we can add assignees
     if response and assignees:
-        add_assignees(response)
+        add_assignees(response, assignees)
     if response and (reviewers or team_reviewers):
         add_reviewers(response, reviewers, team_reviewers)