diff --git a/docker/release/Dockerfile b/docker/release/Dockerfile
index be3fc0d..a72a581 100644
--- a/docker/release/Dockerfile
+++ b/docker/release/Dockerfile
@@ -9,6 +9,8 @@ COPY . /src/actinia-gdi
 WORKDIR /src/actinia-gdi
 # TODO: include tests. Currently only running whith actinia_core installed
 # RUN pip3 install -r requirements.txt && python3 setup.py test
+# build including dependency list from setup.cfg (automatically installed).
+# pip3 wheel creates wheels out of all requirements for offline usage
 RUN python3 -m pep517.build --out-dir /build . && \
     pip3 wheel -r requirements.txt -w /build
 
diff --git a/docker/release/README.md b/docker/release/README.md
index 67118ae..43a3c72 100644
--- a/docker/release/README.md
+++ b/docker/release/README.md
@@ -5,7 +5,7 @@ The `docker build` command builds the wheel and integrated the build-args for
 the github release.
 
 The `docker run` command creates the build and uploads the
-before created wheel as asset.
+previously created wheel as asset.
 
 
 ```