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-rw-r--r--nixos/doc/manual/development/writing-nixos-tests.section.md5
1 files changed, 5 insertions, 0 deletions
diff --git a/nixos/doc/manual/development/writing-nixos-tests.section.md b/nixos/doc/manual/development/writing-nixos-tests.section.md
index 3de46fda3df..486a4b64a26 100644
--- a/nixos/doc/manual/development/writing-nixos-tests.section.md
+++ b/nixos/doc/manual/development/writing-nixos-tests.section.md
@@ -130,6 +130,11 @@ starting them in parallel:
 start_all()
 ```
 
+If the hostname of a node contains characters that can't be used in a
+Python variable name, those characters will be replaced with
+underscores in the variable name, so `nodes.machine-a` will be exposed
+to Python as `machine_a`.
+
 ## Machine objects {#ssec-machine-objects}
 
 The following methods are available on machine objects: