diff --git a/README.derivatives b/README.derivatives
index 59a653a61deabcca25f5a4e38dfb0a5b862f642b..f8d0ce91a615f5d24505aa3199c904033753a0cc 100644
--- a/README.derivatives
+++ b/README.derivatives
@@ -6,7 +6,7 @@ How to change a list of supported Python versions?
   python-all-dbg's Depends line (add or remove pythonX.Y packages)
 * Open debian/pyversions.py file and edit `_supported_versions` list
   around line 141
-* Open debpython/versions.py file and edit `SUPPORTED` list around
+* Open debpython/version.py file and edit `SUPPORTED` list around
   line 26
 
 
@@ -18,7 +18,7 @@ How to change default Python version?
   (default + 1 version) and `PVER` (default version with "python" prefix)
 * Open debian/pyversions.py file and edit `debian_default` variable around
   line 171
-* Open debpython/versions.py file and edit `DEFAULT` variable around line 27
+* Open debpython/version.py file and edit `DEFAULT` variable around line 27
 
 
 How to bump minimum required Python version by dh_python2?