diff --git a/README.md b/README.md
index ea42c9d..2a32432 100644
--- a/README.md
+++ b/README.md
@@ -170,6 +170,7 @@ Prerequisites:
   `poetry self update`
 - python (3.10.12), e.g. using [pyenv](https://github.com/pyenv/pyenv) 
   `pyenv install 3.10.12`
+- set up and running [Duckling](https://github.com/facebook/duckling) server
 
 After you cloned the repository and are authenticated, follow the installation steps:
 
@@ -191,6 +192,7 @@ After you cloned the repository and are authenticated, follow the installation s
    ```bash
    RASA_PRO_LICENSE=<your rasa pro license key>
    OPENAI_API_KEY=<your openai api key>
+   RASA_DUCKLING_HTTP_URL=<url to the duckling server>
    ```
 
 ### Training the bot
diff --git a/actions/entity_extractor.py b/actions/entity_extractor.py
index 18ff9d0..00ba3d2 100644
--- a/actions/entity_extractor.py
+++ b/actions/entity_extractor.py
@@ -4,7 +4,7 @@
 from rasa.nlu.extractors.duckling_entity_extractor import DucklingEntityExtractor
 
 load_dotenv()
-duckling_url = os.environ.get("DUCKLING_URL")
+duckling_url = os.environ.get("RASA_DUCKLING_HTTP_URL")
 
 duckling_config = {
     **DucklingEntityExtractor.get_default_config(),