diff --git a/lib/licenses/licenses.nix b/lib/licenses/licenses.nix
index 12301021e9c8..5d86e5f90ac2 100644
--- a/lib/licenses/licenses.nix
+++ b/lib/licenses/licenses.nix
@@ -263,6 +263,11 @@ lib.mapAttrs mkLicense (
       fullName = "Lawrence Berkeley National Labs BSD variant license";
     };
 
+    bsd3Modification = {
+      spdxId = "BSD-3-Clause-Modification";
+      fullName = "BSD 3-Clause Modification";
+    };
+
     bsd3ClauseTso = {
       spdxId = "BSD-3-Clause-Tso";
       fullName = "BSD 3-Clause Tso variant";
diff --git a/pkgs/development/python-modules/peppercorn/default.nix b/pkgs/development/python-modules/peppercorn/default.nix
index e93f7e5ef44c..a47eb71111ef 100644
--- a/pkgs/development/python-modules/peppercorn/default.nix
+++ b/pkgs/development/python-modules/peppercorn/default.nix
@@ -19,5 +19,6 @@ buildPythonPackage rec {
     homepage = "https://docs.pylonsproject.org/projects/peppercorn/en/latest/";
     maintainers = [ ];
     platforms = lib.platforms.all;
+    license = lib.licenses.bsd3Modification;
   };
 }