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-rw-r--r--lib/path/default.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/path/default.nix b/lib/path/default.nix
index 1300f0f09011d..24a7f85affc1d 100644
--- a/lib/path/default.nix
+++ b/lib/path/default.nix
@@ -319,6 +319,9 @@ in /* No rec! Add dependencies on this file at the top. */ {
 
   /* Whether a value is a valid subpath string.
 
+  A subpath string points to a specific file or directory within an absolute base directory.
+  It is a stricter form of a relative path that excludes `..` components, since those could escape the base directory.
+
   - The value is a string
 
   - The string is not empty