Extend comment

src/global/trampoline.rs

@@ -356,6 +356,7 @@ impl Trampoline {
 
         // If the path doesn't exist yet, create a hard link to the shared trampoline binary
         // If creating a hard link doesn't succeed, try copying
+        // Hard-linking might for example fail because the file-system enforces a maximum number of hard-links per file
         if !self.path().exists()
             && tokio_fs::hard_link(self.trampoline_path(), self.path())
                 .await