diff --git a/examples/build_file_generation/BUILD.bazel b/examples/build_file_generation/BUILD.bazel
index 7c88d92..928fb12 100644
--- a/examples/build_file_generation/BUILD.bazel
+++ b/examples/build_file_generation/BUILD.bazel
@@ -42,6 +42,8 @@
     name = "gazelle_python_manifest",
     modules_mapping = ":modules_map",
     pip_repository_name = "pip",
+    # NOTE: We can pass a list just like in `bzlmod_build_file_generation` example
+    # but we keep a single target here for regression testing.
     requirements = "//:requirements_lock.txt",
     # NOTE: we can use this flag in order to make our setup compatible with
     # bzlmod.
diff --git a/examples/bzlmod_build_file_generation/BUILD.bazel b/examples/bzlmod_build_file_generation/BUILD.bazel
index 498969b..c5e27c2 100644
--- a/examples/bzlmod_build_file_generation/BUILD.bazel
+++ b/examples/bzlmod_build_file_generation/BUILD.bazel
@@ -49,7 +49,10 @@
     name = "gazelle_python_manifest",
     modules_mapping = ":modules_map",
     pip_repository_name = "pip",
-    requirements = "//:requirements_lock.txt",
+    requirements = [
+        "//:requirements_lock.txt",
+        "//:requirements_windows.txt",
+    ],
     # NOTE: we can use this flag in order to make our setup compatible with
     # bzlmod.
     use_pip_repository_aliases = True,
diff --git a/examples/bzlmod_build_file_generation/gazelle_python.yaml b/examples/bzlmod_build_file_generation/gazelle_python.yaml
index 12096e5..e33021b 100644
--- a/examples/bzlmod_build_file_generation/gazelle_python.yaml
+++ b/examples/bzlmod_build_file_generation/gazelle_python.yaml
@@ -232,6 +232,7 @@
     isort.wrap: isort
     isort.wrap_modes: isort
     lazy_object_proxy: lazy_object_proxy
+    lazy_object_proxy.cext: lazy_object_proxy
     lazy_object_proxy.compat: lazy_object_proxy
     lazy_object_proxy.simple: lazy_object_proxy
     lazy_object_proxy.slots: lazy_object_proxy
@@ -587,4 +588,4 @@
   pip_repository:
     name: pip
     use_pip_repository_aliases: true
-integrity: d979738b10adbbaff0884837e4414688990491c6c40f6a25d58b9bb564411477
+integrity: cee7684391c4a8a1ff219cd354deae61cdcdee70f2076789aabd5249f3c4eca9
diff --git a/gazelle/manifest/defs.bzl b/gazelle/manifest/defs.bzl
index 05562a1..f1266a0 100644
--- a/gazelle/manifest/defs.bzl
+++ b/gazelle/manifest/defs.bzl
@@ -30,7 +30,9 @@
 
     Args:
         name: the name used as a base for the targets.
-        requirements: the target for the requirements.txt file.
+        requirements: the target for the requirements.txt file or a list of
+            requirements files that will be concatenated before passing on to
+            the manifest generator.
         pip_repository_name: the name of the pip_install or pip_repository target.
         use_pip_repository_aliases: boolean flag to enable using user-friendly
             python package aliases.
@@ -55,6 +57,16 @@
 
     manifest_generator_hash = Label("//manifest/generate:generate_lib_sources_hash")
 
+    if type(requirements) == "list":
+        native.genrule(
+            name = name + "_requirements_gen",
+            srcs = sorted(requirements),
+            outs = [name + "_requirements.txt"],
+            cmd_bash = "cat $(SRCS) > $@",
+            cmd_bat = "type $(SRCS) > $@",
+        )
+        requirements = name + "_requirements_gen"
+
     update_args = [
         "--manifest-generator-hash",
         "$(rootpath {})".format(manifest_generator_hash),