Improve documentation

README.md

@@ -28,6 +28,13 @@ If you have a list of LaTeX dependencies on a text file (one per line), use:
 <$FILE xargs -- tlmgr install
 ```
 
+### Interaction with Python `venv`
+
+This was specifically created to interoperate with Python's `venv` virtual
+environments. In fact, this has no way to be used standalone for now.
+
+Errors when using this inside a `venv` are a bug.
+
 ## Pedantry
 
 This technically installs the most bare-bones TeXlive schema, with three essential packages:
@@ -43,3 +50,8 @@ If you need a list of packages needed to compile basic files, check TinyTex:
 - https://github.com/yihui/tinytex/blob/master/tools/pkgs-yihui.txt
 - [Requirements for Sphinx PDF](pkgs-sphinx.txt)
    - This might require both lists of packages above
+
+## Compatibility
+
+This theoretically supports any OS that `venv`/TeXlive support, but it wasn't
+tested and will probably break.