diff --git a/docker/.env.example b/docker/.env.example
index d29c66535d..50dc56a5c9 100644
--- a/docker/.env.example
+++ b/docker/.env.example
@@ -574,9 +574,11 @@ UPLOAD_FILE_BATCH_LIMIT=5
 # `Unstructured` Unstructured.io file extraction scheme
 ETL_TYPE=dify
 
-# Unstructured API path, needs to be configured when ETL_TYPE is Unstructured.
+# Unstructured API path and API key, needs to be configured when ETL_TYPE is Unstructured
+# Or using Unstructured for document extractor node for pptx.
 # For example: http://unstructured:8000/general/v0/general
 UNSTRUCTURED_API_URL=
+UNSTRUCTURED_API_KEY=
 
 # ------------------------------
 # Model Configuration
diff --git a/docker/docker-compose.yaml b/docker/docker-compose.yaml
index b47573bfc8..e316ec0c5a 100644
--- a/docker/docker-compose.yaml
+++ b/docker/docker-compose.yaml
@@ -222,6 +222,7 @@ x-shared-env: &shared-api-worker-env
   UPLOAD_FILE_BATCH_LIMIT: ${UPLOAD_FILE_BATCH_LIMIT:-5}
   ETL_TYPE: ${ETL_TYPE:-dify}
   UNSTRUCTURED_API_URL: ${UNSTRUCTURED_API_URL:-}
+  UNSTRUCTURED_API_KEY: ${UNSTRUCTURED_API_KEY:-}
   PROMPT_GENERATION_MAX_TOKENS: ${PROMPT_GENERATION_MAX_TOKENS:-512}
   CODE_GENERATION_MAX_TOKENS: ${CODE_GENERATION_MAX_TOKENS:-1024}
   MULTIMODAL_SEND_IMAGE_FORMAT: ${MULTIMODAL_SEND_IMAGE_FORMAT:-base64}