diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4bab5c6c..4fb67741 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,6 +17,7 @@ jobs:
           TEAMWORK_URI: "localhost"
           TEAMWORK_API_TOKEN: "test_api_token"
           AUTOMATIC_TAGGING: true
+          MAKE_COMMENTS_PRIVATE: true
           BOARD_COLUMN_OPENED: "PR Open"
           BOARD_COLUMN_MERGED: "Ready to Test"
           BOARD_COLUMN_CLOSED: "Rejected"
diff --git a/README.md b/README.md
index 3c54c77b..80e2e942 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@ jobs:
           TEAMWORK_URI: ${{ secrets.TEAMWORK_URI }}
           TEAMWORK_API_TOKEN: ${{ secrets.TEAMWORK_API_TOKEN }}
           AUTOMATIC_TAGGING: false
+          MAKE_COMMENTS_PRIVATE: false
           BOARD_COLUMN_OPENED: 'PR Open'
           BOARD_COLUMN_MERGED: 'Ready to Test'
           BOARD_COLUMN_CLOSED: 'Rejected'
@@ -71,6 +72,8 @@ Tags are added automatically on the task if you are have the option `AUTOMATIC_T
 - A PR is merged: tags `PR Open` and `PR Approved` removed, tag `PR merged` added
 - A PR is closed: tags `PR Open` and `PR Approved` removed
 
+Using the `MAKE_COMMENTS_PRIVATE` flag, you can also optionally set all comments on Teamwork to be private to your organisation.
+
 You may also specify columns you'd like the task to be moved to on every stage of the PR:
 - `BOARD_COLUMN_OPENED`: The case-sensitive column name of the column you'd like the task to be moved to once the PR has been opened
 - `BOARD_COLUMN_MERGED`: The case-sensitive column name of the column you'd like the task to be moved to once the PR has been merged
diff --git a/action.yml b/action.yml
index f704b08a..5e947eb6 100644
--- a/action.yml
+++ b/action.yml
@@ -16,6 +16,9 @@ inputs:
   AUTOMATIC_TAGGING:
     description: 'Do you want to enable automatic tagging: true/false'
     required: false
+  MAKE_COMMENTS_PRIVATE:
+    description: 'Do you want to make all comments private to your organisation: true/false'
+    required: false
   BOARD_COLUMN_OPENED:
     description: 'The case-sensitive column name of the column you would like the task to be moved to once the PR has been opened'
     required: false
@@ -36,6 +39,7 @@ runs:
     - ${{ inputs.TEAMWORK_URI }}
     - ${{ inputs.TEAMWORK_API_TOKEN }}
     - ${{ inputs.AUTOMATIC_TAGGING }}
+    - ${{ inputs.MAKE_COMMENTS_PRIVATE }}
     - ${{ inputs.BOARD_COLUMN_OPENED }}
     - ${{ inputs.BOARD_COLUMN_MERGED }}
     - ${{ inputs.BOARD_COLUMN_CLOSED }}
diff --git a/src/main.sh b/src/main.sh
index cf553262..d2cd4c5a 100644
--- a/src/main.sh
+++ b/src/main.sh
@@ -17,9 +17,10 @@ main() {
   export TEAMWORK_URI="$2"
   export TEAMWORK_API_TOKEN="$3"
   export AUTOMATIC_TAGGING="$4"
-  export BOARD_COLUMN_OPENED="$5"
-  export BOARD_COLUMN_MERGED="$6"
-  export BOARD_COLUMN_CLOSED="$7"
+  export MAKE_COMMENTS_PRIVATE="$5"
+  export BOARD_COLUMN_OPENED="$6"
+  export BOARD_COLUMN_MERGED="$7"
+  export BOARD_COLUMN_CLOSED="$8"
 
   env::set_environment
 
diff --git a/src/teamwork.sh b/src/teamwork.sh
index b3c5e687..7d4b24ef 100644
--- a/src/teamwork.sh
+++ b/src/teamwork.sh
@@ -94,7 +94,16 @@ teamwork::add_comment() {
   response=$(curl -X "POST" "$TEAMWORK_URI/tasks/$TEAMWORK_TASK_ID/comments.json" \
        -u "$TEAMWORK_API_TOKEN"':' \
        -H 'Content-Type: application/json; charset=utf-8' \
-       -d "{ \"comment\": { \"body\": \"${body//\"/}\", \"notify\": true, \"content-type\": \"text\", \"isprivate\": false } }" )
+       -d "{
+          \"comment\": {
+              \"body\": \"${body//\"/}\",
+              \"notify\": true,
+              \"content-type\":
+              \"text\",
+              \"isprivate\": $([ "$MAKE_COMMENTS_PRIVATE" == true ] && echo true || echo false)
+          }
+      }"
+  )
 
   log::message "$response"
 }