diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index cf6f7e3..461319e 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -4330,7 +4330,7 @@
   if (needs_write_barrier) {
     // Temporary registers for the write barrier.
     locations->AddTemp(Location::RequiresRegister());  // Possibly used for ref. poisoning too.
-    locations->AddTemp(Location::RequiresRegister());  // Possibly used for read barrier too.
+    locations->AddTemp(Location::RequiresRegister());
   }
 }
 
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index 53e33bf..6a9177d 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -4854,7 +4854,7 @@
     // Temporary registers for the write barrier.
     locations->AddTemp(Location::RequiresRegister());  // Possibly used for ref. poisoning too.
     // Ensure the card is in a byte register.
-    locations->AddTemp(Location::RegisterLocation(ECX));  // Possibly used for read barrier too.
+    locations->AddTemp(Location::RegisterLocation(ECX));
   }
 }
 
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index 0e0b869..8cfd8cb 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -4496,8 +4496,6 @@
     // This first temporary register is possibly used for heap
     // reference poisoning and/or read barrier emission too.
     locations->AddTemp(Location::RequiresRegister());
-    // This second temporary register is possibly used for read
-    // barrier emission too.
     locations->AddTemp(Location::RequiresRegister());
   }
 }