diff --git a/doc/contributing/collaborator-guide.md b/doc/contributing/collaborator-guide.md
index c0777771be631e..b81a86bd86c08f 100644
--- a/doc/contributing/collaborator-guide.md
+++ b/doc/contributing/collaborator-guide.md
@@ -443,10 +443,12 @@ metadata. Raise a pull request like any other change.
 
 Treat commits that introduce new core modules with extra care.
 
-New modules must only be added with the `node:` prefix.
+New modules must only be added with the `node:` prefix, as `semver-minor`.
 
-When adding promises to an existing API, add `/promises`
-(`inspector/promises`, etc.). Apply the `semver-major` label to the addition.
+When adding a "sub-module", e.g. a promise variant of an existing API (e.g.
+`node:inspector/promises`) that is available without the `node:` prefix, making
+the sub-module available without the prefix is possible behind a runtime flag,
+or as a `semver-major` change.
 
 If the new module name is free in npm, register
 a placeholder in the module registry as soon as possible. Link to the pull