1 files changed, 3 insertions, 0 deletions
diff --git a/olddefconfig.py b/olddefconfig.py
index c985bfa..1d1bac1 100755
--- a/olddefconfig.py
+++ b/olddefconfig.py
@@ -11,6 +11,9 @@ saving.
 
 The default input/output filename is '.config'. A different filename can be
 passed in the KCONFIG_CONFIG environment variable.
+
+When overwriting a configuration file, the old version is saved to
+<filename>.old (e.g. .config.old).
 """
 import kconfiglib