Add note about paths and $HOME substitution

mgudemann · Oct 19, 2021 · 0123456 · 0123456
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commit 0123456
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diff --git a/README.md b/README.md
@@ -32,6 +32,8 @@ courses:
   - vss
 ```
 
+Placeholders like `$HOME` are not substituted but taken verbatim. It is therefore best to specify absolute paths.
+
 ### Course config file
 
 Each course file must be named like the entries in the main config file, e.g., `algdatii.yml` and `vss.yml` in the above example.