diff --git a/src/gn/ninja_action_target_writer.cc b/src/gn/ninja_action_target_writer.cc
index c48da06..bfceef9 100644
--- a/src/gn/ninja_action_target_writer.cc
+++ b/src/gn/ninja_action_target_writer.cc
@@ -29,18 +29,18 @@
 void NinjaActionTargetWriter::Run() {
   std::string custom_rule_name = WriteRuleDefinition();
 
-  // Collect our deps to pass as "extra hard dependencies" for input deps. This
-  // will force all of the action's dependencies to be completed before the
-  // action is run. Usually, if an action has a dependency, it will be
+  // Collect our deps to pass as additional "hard dependencies" for input deps.
+  // This will force all of the action's dependencies to be completed before
+  // the action is run. Usually, if an action has a dependency, it will be
   // operating on the result of that previous step, so we need to be sure to
   // serialize these.
-  std::vector<const Target*> extra_hard_deps;
+  std::vector<const Target*> additional_hard_deps;
   std::vector<OutputFile> data_outs;
   for (const auto& pair : target_->GetDeps(Target::DEPS_LINKED)) {
     if (pair.ptr->IsDataOnly()) {
       data_outs.push_back(pair.ptr->dependency_output_file());
     } else {
-      extra_hard_deps.push_back(pair.ptr);
+      additional_hard_deps.push_back(pair.ptr);
     }
   }
 
@@ -50,7 +50,7 @@
   size_t num_stamp_uses =
       target_->output_type() == Target::ACTION ? 1u : target_->sources().size();
   std::vector<OutputFile> input_deps =
-      WriteInputDepsStampAndGetDep(extra_hard_deps, num_stamp_uses);
+      WriteInputDepsStampAndGetDep(additional_hard_deps, num_stamp_uses);
   out_ << std::endl;
 
   // Collects all output files for writing below.
diff --git a/src/gn/ninja_target_writer.cc b/src/gn/ninja_target_writer.cc
index 421c575..c8e7ebd 100644
--- a/src/gn/ninja_target_writer.cc
+++ b/src/gn/ninja_target_writer.cc
@@ -188,7 +188,7 @@
 }
 
 std::vector<OutputFile> NinjaTargetWriter::WriteInputDepsStampAndGetDep(
-    const std::vector<const Target*>& extra_hard_deps,
+    const std::vector<const Target*>& additional_hard_deps,
     size_t num_stamp_uses) const {
   CHECK(target_->toolchain()) << "Toolchain not set on target "
                               << target_->label().GetUserVisibleName(true);
@@ -241,9 +241,9 @@
       input_deps_targets.push_back(target);
   }
 
-  // Extra hard dependencies passed in. These are usually empty or small, and
-  // we don't want to duplicate the explicit hard deps of the target.
-  for (const Target* target : extra_hard_deps) {
+  // Additional hard dependencies passed in. These are usually empty or small,
+  // and we don't want to duplicate the explicit hard deps of the target.
+  for (const Target* target : additional_hard_deps) {
     if (!hard_deps.count(target))
       input_deps_targets.push_back(target);
   }
diff --git a/src/gn/ninja_target_writer.h b/src/gn/ninja_target_writer.h
index f4c9eae..efcf73d 100644
--- a/src/gn/ninja_target_writer.h
+++ b/src/gn/ninja_target_writer.h
@@ -45,10 +45,10 @@
   // order-only dependencies for the current target.
   // If num_stamp_uses is small, this might return all input dependencies
   // directly, without writing a stamp file.
-  // If there are no implicit dependencies and no extra target dependencies
+  // If there are no implicit dependencies and no additional target dependencies
   // are passed in, this returns an empty vector.
   std::vector<OutputFile> WriteInputDepsStampAndGetDep(
-      const std::vector<const Target*>& extra_hard_deps,
+      const std::vector<const Target*>& additional_hard_deps,
       size_t num_stamp_uses) const;
 
   // Writes to the output file a final stamp rule for the target that stamps
diff --git a/src/gn/ninja_target_writer_unittest.cc b/src/gn/ninja_target_writer_unittest.cc
index 1b19159..7a04e3c 100644
--- a/src/gn/ninja_target_writer_unittest.cc
+++ b/src/gn/ninja_target_writer_unittest.cc
@@ -23,9 +23,9 @@
 
   // Make this public so the test can call it.
   std::vector<OutputFile> WriteInputDepsStampAndGetDep(
-      const std::vector<const Target*>& extra_hard_deps,
+      const std::vector<const Target*>& additional_hard_deps,
       size_t num_stamp_uses) {
-    return NinjaTargetWriter::WriteInputDepsStampAndGetDep(extra_hard_deps,
+    return NinjaTargetWriter::WriteInputDepsStampAndGetDep(additional_hard_deps,
                                                            num_stamp_uses);
   }
 };