diff --git a/engine/src/flutter/tools/gn b/engine/src/flutter/tools/gn
index 008d20cd8d4..6616060e952 100755
--- a/engine/src/flutter/tools/gn
+++ b/engine/src/flutter/tools/gn
@@ -132,7 +132,7 @@ def to_gn_args(args):
       if 'target_cpu' in gn_args:
         gn_args['target_cpu'] = cpu_for_target_arch(gn_args['target_cpu'])
 
-    # Modify host_toolchain into dart_host_toolchain so it matches word size of target_cpu
+    # Make sure host_cpu matches the bit width of target_cpu.
     target_is_32_bit = gn_args['target_cpu'] == 'arm' or gn_args['target_cpu'] == 'x86'
     if target_is_32_bit:
       gn_args["host_cpu"] = "x86"