Document environment variables

When using configurable components, clearly document all relevant environment variables and their effects. Include examples showing how to set variables for common use cases, and specify any platform-specific differences. For environment variables that affect runtime behavior, clearly document when they need to be set and any order dependencies.

For example, when documenting Python interoperability configuration:

// Environment variables for Python configuration:
// PYTHON_LIBRARY="~/anaconda3/lib/libpython3.7m.so" - Sets specific Python library (takes precedence)
// PYTHON_VERSION="3.7" - Searches system paths for this Python version
// PYTHON_LOADER_LOGGING=1 - Enables debug output for Python library loading

// Note: Version selection must occur before any Python code is executed
import Python
// PythonLibrary.useVersion(3, 7)  // Must be called immediately after import

print(Python.version)  // Now safe to use Python

Note platform-specific variations when they exist, as with the Python library path example: “The exact filename will differ across Python environments and platforms.” Including such details helps users successfully configure their environment regardless of their system.