diff --git a/.github/workflows/api-changelog-check.yml b/.github/workflows/api-changelog-check.yml
new file mode 100644
index 0000000..6d1ea1c
--- /dev/null
+++ b/.github/workflows/api-changelog-check.yml
@@ -0,0 +1,67 @@
+name: API Changelog Check
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+    paths:
+      - 'codegen/aws-models/**'
+
+permissions:
+  contents: read
+
+jobs:
+  check-changelog:
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.pull_request.labels.*.name, 'skip-changelog') }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
+        with:
+          fetch-depth: 0
+
+      - name: Get changed model files
+        id: changed-models
+        run: |
+          changed_models=$(git diff --name-only origin/${{ github.base_ref }}...HEAD -- 'codegen/aws-models/*.json' | xargs -I {} basename {} .json)
+          echo "models<<EOF" >> $GITHUB_OUTPUT
+          echo "$changed_models" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+      - name: Check for changelog entries
+        run: |
+          missing_changelogs=""
+
+          while IFS= read -r service; do
+            [ -z "$service" ] && continue
+
+            changelog_dir="clients/aws-sdk-${service}/.changes/next-release"
+
+            if [ ! -d "$changelog_dir" ]; then
+              missing_changelogs="${missing_changelogs}\n  - ${service} (directory does not exist: ${changelog_dir})"
+              continue
+            fi
+
+            # Check for valid changelog JSON files with required fields
+            valid_entry_found=false
+            for file in "$changelog_dir"/*.json; do
+              [ -e "$file" ] || continue
+              if jq -e '.type == "api-change" and .description' "$file" > /dev/null 2>&1; then
+                valid_entry_found=true
+                break
+              fi
+            done
+
+            if [ "$valid_entry_found" = false ]; then
+              missing_changelogs="${missing_changelogs}\n  - ${service} (no valid changelog entry in ${changelog_dir})"
+            fi
+          done <<< "${{ steps.changed-models.outputs.models }}"
+
+          if [ -n "$missing_changelogs" ]; then
+            printf "::error::Missing changelog entries for the following services:%b\n" "$missing_changelogs"
+            echo ""
+            echo "Please add a changelog entry in clients/aws-sdk-<service>/.changes/next-release/ for each modified model."
+            echo "Entry must be a JSON file with 'type: \"api-change\"' and 'description' fields."
+            exit 1
+          fi
+
+          echo "All modified models have corresponding changelog entries."
diff --git a/clients/aws-sdk-bedrock-runtime/.changes/next-release/testing.json b/clients/aws-sdk-bedrock-runtime/.changes/next-release/testing.json
new file mode 100644
index 0000000..c44ee7f
--- /dev/null
+++ b/clients/aws-sdk-bedrock-runtime/.changes/next-release/testing.json
@@ -0,0 +1,4 @@
+{
+  "type": "dependency",
+  "description": "this is a test"
+}
diff --git a/clients/aws-sdk-transcribe-streaming/.changes/next-release/testing.json b/clients/aws-sdk-transcribe-streaming/.changes/next-release/testing.json
new file mode 100644
index 0000000..988ef23
--- /dev/null
+++ b/clients/aws-sdk-transcribe-streaming/.changes/next-release/testing.json
@@ -0,0 +1,4 @@
+{
+  "type": "bugfix",
+  "description": "this is a test"
+}
diff --git a/codegen/aws-models/bedrock-runtime.json b/codegen/aws-models/bedrock-runtime.json
index fc1ac68..28cd5fe 100644
--- a/codegen/aws-models/bedrock-runtime.json
+++ b/codegen/aws-models/bedrock-runtime.json
@@ -77,7 +77,7 @@
                     "aws.auth#sigv4",
                     "smithy.api#httpBearerAuth"
                 ],
-                "smithy.api#documentation": "<p>Describes the API operations for running inference using Amazon Bedrock models.</p>",
+                "smithy.api#documentation": "<p>testing Describes the API operations for running inference using Amazon Bedrock models.</p>",
                 "smithy.api#httpBearerAuth": {},
                 "smithy.api#title": "Amazon Bedrock Runtime",
                 "smithy.rules#endpointRuleSet": {
@@ -7382,4 +7382,4 @@
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/codegen/aws-models/transcribe-streaming.json b/codegen/aws-models/transcribe-streaming.json
index b5e6ff0..ac419ad 100644
--- a/codegen/aws-models/transcribe-streaming.json
+++ b/codegen/aws-models/transcribe-streaming.json
@@ -52,7 +52,7 @@
                 }
             },
             "traits": {
-                "smithy.api#documentation": "<p>A list of possible alternative transcriptions for the input audio. Each alternative may contain\n      one or more of <code>Items</code>, <code>Entities</code>, or <code>Transcript</code>.</p>"
+                "smithy.api#documentation": "<p>testing A list of possible alternative transcriptions for the input audio. Each alternative may contain\n      one or more of <code>Items</code>, <code>Entities</code>, or <code>Transcript</code>.</p>"
             }
         },
         "com.amazonaws.transcribestreaming#AlternativeList": {