diff --git a/compiler/dex/quick/arm/utility_arm.cc b/compiler/dex/quick/arm/utility_arm.cc
index 8a8b168..fa05d6c 100644
--- a/compiler/dex/quick/arm/utility_arm.cc
+++ b/compiler/dex/quick/arm/utility_arm.cc
@@ -210,6 +210,9 @@
 }
 
 LIR* ArmMir2Lir::OpCondBranch(ConditionCode cc, LIR* target) {
+  // This is kThumb2BCond instead of kThumbBCond for performance reasons. The assembly
+  // time required for a new pass after kThumbBCond is fixed up to kThumb2BCond is
+  // substantial.
   LIR* branch = NewLIR2(kThumb2BCond, 0 /* offset to be patched */,
                         ArmConditionEncoding(cc));
   branch->target = target;