Unfamiliar error

[ErnestTBass]

I get the following warning when I try to run a

conda env create -f environment.yml

Error:
Warning: you have pip-installed dependencies in your environment file, but you do not list pip itself as one of your conda dependencies.  Conda may not use the correct pip to install your packages, and they may end up in the wrong place.  Please add an explicit pip dependency.  I'm adding one for you, but still nagging you.

I googled the term and it is still not clear. What does "Please add an explicit pip dependency" mean and how do I do it?

Any help appreciated. Thanks in advance.

Respectfully,

ErnestTBass