Clarify [DEPENDENCY] marker and ci.yml.in dependency-source comment

README.md

@@ -539,7 +539,9 @@ The dependency provider (CMake 3.24+) tracks `find_package()` and `CPMAddPackage
 
 ## Development
 
-To update cpp-library dependencies search for `[DEPENDENCY]`.
+To update cpp-library dependencies search for `[DEPENDENCY]`. Embed the marker in an HTML
+comment (e.g. `<!-- [DEPENDENCY] -->`) rather than as visible text, so it doesn't render in
+rendered docs.
 
 To use a local copy of cpp-library:
 

templates/.github/workflows/ci.yml.in

@@ -1,6 +1,7 @@
 # Auto-generated from cpp-library (https://github.com/stlab/cpp-library)
 # Do not edit this file directly - it will be overwritten when templates are regenerated
-# Dependency versions are defined in cmake/cpp-library-ci.cmake (with source links)
+# Dependency versions are defined in cpp-library's cmake/cpp-library-ci.cmake
+# (https://github.com/stlab/cpp-library/blob/main/cmake/cpp-library-ci.cmake), not in this repo
 
 name: CI