diff --git a/src/options/generate/generator.py b/src/options/generate/generator.py
index f3ef5fe..4174ce7 100644
--- a/src/options/generate/generator.py
+++ b/src/options/generate/generator.py
@@ -216,7 +216,7 @@ metas:
 
     def parse_result_fn_dockerfile(self, content_raw: str):
         json_string = self.extract_content_from_result(content_raw, 'apt-get-packages.json', match_single_block=True)
-        packages = json.loads(json_string)['packages']
+        packages = ' '.join(json.loads(json_string)['packages'])
 
         docker_file_template = self.read_docker_template()
         return {DOCKER_FILE_NAME: docker_file_template.replace('{{apt_get_packages}}', '{apt_get_packages}').format(apt_get_packages=packages)}
diff --git a/src/options/generate/templates_user.py b/src/options/generate/templates_user.py
index aba7c60..266408b 100644
--- a/src/options/generate/templates_user.py
+++ b/src/options/generate/templates_user.py
@@ -181,16 +181,23 @@ Name all packages which need to be installed via `apt-get install` in above Dock
 
 Note that you must not list apt-get packages that are already installed in the Dockerfile.
 Note that openai does not require any apt-get packages.
-Note that you only list packages where you are highly confident that they are really needed.
+Note that you are only allowed to list packages where you are highly confident that they are really needed.
+Note that you can assume that the standard python packages are already installed.
 Output the packages that need to me placed at {{apt_get_packages}} as json in the following format:
 **apt-get-packages.json**
 ```json
 {{"packages": ["<package1>", "<package2>"]}}
 ```
-Have in mind that the packages list can be empty like this:
+Example for the following requirements.txt file:
+**requirements.txt**
+```
+numpy==1.19.5
+fitz
+```
+The output would be:
 **apt-get-packages.json**
 ```json
-{{"packages": []}}
+{"packages": []}
 ```
 '''
 )