- added explanation

diff --git a/client/installation-helper.cc b/client/installation-helper.cc
index fbfbba5e53e074b6d460be17974db2111589e4c1..7c18f7d4d699ff9031ceb26d22ad61ca236a1b12 100644 (file)
--- a/client/installation-helper.cc
+++ b/client/installation-helper.cc
@@ -110,6 +110,9 @@ step2(const string& device, const string& root_prefix, const string& default_sub
 
     cout << "mounting device" << endl;
 
+    // The btrfs subvol mount option is either "@/.snapshots" or just
+    // ".snapshots" depending on whether default_subvolume_name is e.g. "@" or
+    // "".
     string subvol_option = default_subvolume_name;
     if (!subvol_option.empty())
        subvol_option += "/";