diff --git a/web/src/components/DiffViewer/DiffViewerUtils.tsx b/web/src/components/DiffViewer/DiffViewerUtils.tsx
index 8aeedcea0..dd8a59526 100644
--- a/web/src/components/DiffViewer/DiffViewerUtils.tsx
+++ b/web/src/components/DiffViewer/DiffViewerUtils.tsx
@@ -36,7 +36,9 @@ export enum CommentType {
   BRANCH_DELETE = 'branch-delete',
   BRANCH_RESTORE = 'branch-restore',
   STATE_CHANGE = 'state-change',
-  LABEL_MODIFY = 'label-modify'
+  LABEL_MODIFY = 'label-modify',
+  REVIEWER_ADD = 'reviewer-add',
+  REVIEWER_DELETE = 'reviewer-delete'
 }
 
 export enum LabelActivity {
@@ -45,6 +47,12 @@ export enum LabelActivity {
   RE_ASSIGN = 'reassign'
 }
 
+export enum ReviewerAddActivity {
+  REQUESTED = 'requested',
+  ASSIGNED = 'assigned',
+  SELF_ASSIGNED = 'self_assigned'
+}
+
 /**
  * @deprecated
  */
diff --git a/web/src/framework/strings/stringTypes.ts b/web/src/framework/strings/stringTypes.ts
index 99de6df2b..470371068 100644
--- a/web/src/framework/strings/stringTypes.ts
+++ b/web/src/framework/strings/stringTypes.ts
@@ -851,6 +851,11 @@ export interface StringsMap {
   prGenSummary: string
   prHasNoConflicts: string
   prMustSelectSourceAndTargetBranches: string
+  'prReview.assigned': string
+  'prReview.removed': string
+  'prReview.requested': string
+  'prReview.selfAssigned': string
+  'prReview.selfRemoved': string
   prSourceAndTargetMustBeDifferent: string
   'prState.draftDesc': string
   'prState.draftHeading': string
diff --git a/web/src/i18n/strings.en.yaml b/web/src/i18n/strings.en.yaml
index 8b9b46b48..c619562d1 100644
--- a/web/src/i18n/strings.en.yaml
+++ b/web/src/i18n/strings.en.yaml
@@ -367,6 +367,12 @@ prChecks:
   killed: '{count}/{total} {count|1:check,checks} killed.'
   notFound: No pipelines or external checks found for this repository.
   viewExternal: View Details
+prReview:
+  assigned: '{author} assigned {reviewer} as a reviewer'
+  requested: '{author} requested a review from {reviewer}'
+  selfAssigned: '{reviewer} self-requested a review'
+  removed: '{author} removed the request for review from {reviewer}'
+  selfRemoved: '{author} removed their request for review'
 webhookListingContent: 'create,delete,deployment ...'
 general: 'General'
 webhooks: 'Webhooks'
diff --git a/web/src/pages/PullRequest/Conversation/SystemComment.tsx b/web/src/pages/PullRequest/Conversation/SystemComment.tsx
index 6ab24e551..8255b88bf 100644
--- a/web/src/pages/PullRequest/Conversation/SystemComment.tsx
+++ b/web/src/pages/PullRequest/Conversation/SystemComment.tsx
@@ -19,13 +19,13 @@ import { Avatar, Container, Layout, StringSubstitute, Text } from '@harnessio/ui
 import { Icon, IconName } from '@harnessio/icons'
 import { Color, FontVariation } from '@harnessio/design-system'
 import { defaultTo } from 'lodash-es'
-import { Case, Match } from 'react-jsx-match'
+import { Case, Falsy, Match, Truthy } from 'react-jsx-match'
 import { CodeIcon, GitInfoProps, MergeStrategy } from 'utils/GitUtils'
 import { useStrings } from 'framework/strings'
 import type { TypesPullReqActivity } from 'services/code'
 import type { CommentItem } from 'components/CommentBox/CommentBox'
 import { PullRequestSection } from 'utils/Utils'
-import { CommentType, LabelActivity } from 'components/DiffViewer/DiffViewerUtils'
+import { CommentType, LabelActivity, ReviewerAddActivity } from 'components/DiffViewer/DiffViewerUtils'
 import { useAppContext } from 'AppContext'
 import { CommitActions } from 'components/CommitActions/CommitActions'
 import { PipeSeparator } from 'components/PipeSeparator/PipeSeparator'
@@ -44,6 +44,10 @@ interface MergePayload {
   merge_method: string
   rules_bypassed: boolean
 }
+
+interface ReviewerAddActivityPayload {
+  reviewer_type: ReviewerAddActivity
+}
 //ToDo : update all comment options with the correct payload type and remove Unknown
 export const SystemComment: React.FC<SystemCommentProps> = ({ pullReqMetadata, commentItems, repoMetadataPath }) => {
   const { getString } = useStrings()
@@ -424,6 +428,99 @@ export const SystemComment: React.FC<SystemCommentProps> = ({ pullReqMetadata, c
       )
     }
 
+    case CommentType.REVIEWER_ADD: {
+      const mentionId = payload?.metadata?.mentions?.ids?.[0] ?? 0
+      const mentionDisplayName = payload?.mentions?.[mentionId]?.display_name ?? ''
+      return (
+        <Container className={css.mergedBox}>
+          <Layout.Horizontal spacing="small" style={{ alignItems: 'center' }}>
+            <Avatar name={payload?.author?.display_name} size="small" hoverCard={false} />
+            <Text tag="div">
+              <Match expr={(payload?.payload as ReviewerAddActivityPayload).reviewer_type}>
+                <Case val={ReviewerAddActivity.ASSIGNED}>
+                  <StringSubstitute
+                    str={getString('prReview.assigned')}
+                    vars={{
+                      author: <strong>{payload?.author?.display_name}</strong>,
+                      reviewer: <strong>{mentionDisplayName}</strong>
+                    }}
+                  />
+                </Case>
+                <Case val={ReviewerAddActivity.REQUESTED}>
+                  <StringSubstitute
+                    str={getString('prReview.requested')}
+                    vars={{
+                      author: <strong>{payload?.author?.display_name}</strong>,
+                      reviewer: <strong>{mentionDisplayName}</strong>
+                    }}
+                  />
+                </Case>
+                <Case val={ReviewerAddActivity.SELF_ASSIGNED}>
+                  <StringSubstitute
+                    str={getString('prReview.selfAssigned')}
+                    vars={{
+                      reviewer: <strong>{mentionDisplayName}</strong>
+                    }}
+                  />
+                </Case>
+              </Match>
+            </Text>
+            <PipeSeparator height={9} />
+
+            <TimePopoverWithLocal
+              time={defaultTo(payload?.created as number, 0)}
+              inline={true}
+              width={100}
+              font={{ variation: FontVariation.SMALL }}
+              color={Color.GREY_400}
+            />
+          </Layout.Horizontal>
+        </Container>
+      )
+    }
+
+    case CommentType.REVIEWER_DELETE: {
+      const mentionId = payload?.metadata?.mentions?.ids?.[0] ?? 0
+      const mentionDisplayName = payload?.mentions?.[mentionId]?.display_name ?? ''
+      return (
+        <Container className={css.mergedBox}>
+          <Layout.Horizontal spacing="small" style={{ alignItems: 'center' }}>
+            <Avatar name={payload?.author?.display_name} size="small" hoverCard={false} />
+            <Text tag="div">
+              <Match expr={payload?.author?.id === mentionId}>
+                <Truthy>
+                  <StringSubstitute
+                    str={getString('prReview.selfRemoved')}
+                    vars={{
+                      author: <strong>{payload?.author?.display_name}</strong>
+                    }}
+                  />
+                </Truthy>
+                <Falsy>
+                  <StringSubstitute
+                    str={getString('prReview.removed')}
+                    vars={{
+                      author: <strong>{payload?.author?.display_name}</strong>,
+                      reviewer: <strong>{mentionDisplayName}</strong>
+                    }}
+                  />
+                </Falsy>
+              </Match>
+            </Text>
+            <PipeSeparator height={9} />
+
+            <TimePopoverWithLocal
+              time={defaultTo(payload?.created as number, 0)}
+              inline={true}
+              width={100}
+              font={{ variation: FontVariation.SMALL }}
+              color={Color.GREY_400}
+            />
+          </Layout.Horizontal>
+        </Container>
+      )
+    }
+
     default: {
       // eslint-disable-next-line no-console
       console.warn('Unable to render system type activity', commentItems)
diff --git a/web/src/services/code/index.tsx b/web/src/services/code/index.tsx
index d0524c1a1..8ea7898b2 100644
--- a/web/src/services/code/index.tsx
+++ b/web/src/services/code/index.tsx
@@ -135,6 +135,7 @@ export type EnumPullReqActivityType =
   | 'label-modify'
   | 'merge'
   | 'review-submit'
+  | 'reviewer-add'
   | 'reviewer-delete'
   | 'state-change'
   | 'title-change'
@@ -4996,6 +4997,7 @@ export interface ListPullReqActivitiesQueryParams {
     | 'label-modify'
     | 'merge'
     | 'review-submit'
+    | 'reviewer-add'
     | 'reviewer-delete'
     | 'state-change'
     | 'title-change'
diff --git a/web/src/services/code/swagger.yaml b/web/src/services/code/swagger.yaml
index 01d2d91aa..9fa503ccf 100644
--- a/web/src/services/code/swagger.yaml
+++ b/web/src/services/code/swagger.yaml
@@ -4644,6 +4644,7 @@ paths:
                 - label-modify
                 - merge
                 - review-submit
+                - reviewer-add
                 - reviewer-delete
                 - state-change
                 - title-change
@@ -4772,6 +4773,12 @@ paths:
               schema:
                 $ref: '#/components/schemas/UsererrorError'
           description: Not Found
+        '409':
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/UsererrorError'
+          description: Conflict
         '422':
           content:
             application/json:
@@ -4834,6 +4841,12 @@ paths:
               schema:
                 $ref: '#/components/schemas/UsererrorError'
           description: Forbidden
+        '409':
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/UsererrorError'
+          description: Conflict
         '422':
           content:
             application/json:
@@ -10562,6 +10575,7 @@ components:
         - label-modify
         - merge
         - review-submit
+        - reviewer-add
         - reviewer-delete
         - state-change
         - title-change