kaxil commented on a change in pull request #8513:
URL: https://github.com/apache/airflow/pull/8513#discussion_r412922247



##########
File path: README.md
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@@ -87,6 +88,34 @@ For further information, please visit the [Airflow 
Wiki](https://cwiki.apache.or
 
 Official container (Docker) images for Apache Airflow are described in 
[IMAGES.rst](IMAGES.rst).
 
+## Installing from PyPI
+
+Airflow is published as `apache-airflow` package in PyPi. Installing it 
however might be sometimes tricky
+because Airflow is a bit of both a library and application. Libraries usually 
keep their dependencies open and
+Applications usually pin them but we should do neither and both at the same 
time. We decided to keep
+our dependencies as open as possible (in setup.py) so users are not limited to 
certain versions of
+dependencies. This means that from time to time `pip install apache-airflow` 
will not work or will
+produce unusable Airflow installation.
+
+In order to have repeatable installation, however starting from Airlfow 
1.10.10 we also keep a set of
+"known-to-be-working" requirements.txt in the requirements folder. Those 
"known-to-be-working"

Review comment:
       ```suggestion
   "known-to-be-working" `requirements.txt` in the requirements folder. Those 
"known-to-be-working"
   ```




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