diff --git a/backend/src/case_file/case_file.graphql b/backend/src/case_file/case_file.graphql
index 1fbe6d18..55357ce9 100644
--- a/backend/src/case_file/case_file.graphql
+++ b/backend/src/case_file/case_file.graphql
@@ -117,6 +117,13 @@ input CreateSupplementalNoteInput {
   createUserId: String!
 }
 
+input UpdateSupplementalNoteInput {
+  caseIdentifier: String!
+  note: String!
+  actor: String!
+  updateUserId: String!
+}
+
 type Query {
   getCaseFile( caseIdentifier: String!): CaseFile
   getCaseFileByLeadId( leadIdentifier: String!): CaseFile
@@ -130,4 +137,5 @@ type Mutation {
   updatePrevention(updatePreventionInput: UpdatePreventionInput!): CaseFile!
 
   createNote(input: CreateSupplementalNoteInput!): CaseFile!
+  updateNote(input: UpdateSupplementalNoteInput!): CaseFile!
 }
diff --git a/backend/src/case_file/case_file.resolver.ts b/backend/src/case_file/case_file.resolver.ts
index a47eb9e8..bef86b04 100644
--- a/backend/src/case_file/case_file.resolver.ts
+++ b/backend/src/case_file/case_file.resolver.ts
@@ -7,6 +7,7 @@ import { UseGuards } from "@nestjs/common";
 import { Role } from "../enum/role.enum";
 import { Roles } from "../auth/decorators/roles.decorator";
 import { CreateSupplementalNoteInput } from './dto/supplemental-note/create-supplemental-note.input';
+import { UpdateSupplementalNoteInput } from './dto/supplemental-note/update-supplemental-note.input';
 
 @UseGuards(JwtRoleGuard)
 @Resolver('CaseFile')
@@ -54,4 +55,10 @@ export class CaseFileResolver {
   createNote(@Args("input") input: CreateSupplementalNoteInput) {
     return this.caseFileService.createNote(input);
   }
+
+  @Mutation("updateNote")
+  @Roles(Role.COS_OFFICER)
+  updateNote(@Args("input") input: UpdateSupplementalNoteInput) {
+    return this.caseFileService.updateNote(input);
+  }
 }
diff --git a/backend/src/case_file/case_file.service.ts b/backend/src/case_file/case_file.service.ts
index d0fd0fc3..5e053e55 100644
--- a/backend/src/case_file/case_file.service.ts
+++ b/backend/src/case_file/case_file.service.ts
@@ -7,6 +7,7 @@ import { GraphQLError } from "graphql";
 import { CreateSupplementalNoteInput } from "./dto/supplemental-note/create-supplemental-note.input";
 import { Note } from "./entities/supplemental-note/supplemental-note.entity";
 import { ACTION_CODES } from "../common/action_codes";
+import { UpdateSupplementalNoteInput } from "./dto/supplemental-note/update-supplemental-note.input";
 
 @Injectable()
 export class CaseFileService {
@@ -633,6 +634,12 @@ export class CaseFileService {
     return await this._upsertNote(caseFileId, note, actor, createUserId);
   };
 
+  updateNote = async (input: UpdateSupplementalNoteInput): Promise<CaseFile> => {
+    const { caseIdentifier: caseFileId, actor, note, updateUserId } = input;
+
+    return await this._upsertNote(caseFileId, note, actor, updateUserId);
+  }
+
   private _upsertNote = async (caseId: string, note: string, actor: string, userId: string): Promise<CaseFile> => {
     const _hasAction = async (caseId: string): Promise<boolean> => {
       const NOTES_QUERY = `SELECT a.action_type_action_xref_guid AS actionId FROM case_management.action_type_action_xref atax 
diff --git a/backend/src/case_file/dto/supplemental-note/create-supplemental-note.input.ts b/backend/src/case_file/dto/supplemental-note/create-supplemental-note.input.ts
index 29d5abeb..317c2cd1 100644
--- a/backend/src/case_file/dto/supplemental-note/create-supplemental-note.input.ts
+++ b/backend/src/case_file/dto/supplemental-note/create-supplemental-note.input.ts
@@ -5,4 +5,4 @@ export class CreateSupplementalNoteInput {
   createUserId: string;
   actor: string;
   note: string;
-}
+}
\ No newline at end of file
diff --git a/backend/src/case_file/dto/supplemental-note/update-supplemental-note.input.ts b/backend/src/case_file/dto/supplemental-note/update-supplemental-note.input.ts
new file mode 100644
index 00000000..31e25e29
--- /dev/null
+++ b/backend/src/case_file/dto/supplemental-note/update-supplemental-note.input.ts
@@ -0,0 +1,6 @@
+export class UpdateSupplementalNoteInput {
+  caseIdentifier: string;
+  updateUserId: string;
+  actor: string;
+  note: string;
+}