diff --git a/src/hotspot/cpu/arm/frame_arm.hpp b/src/hotspot/cpu/arm/frame_arm.hpp
index 6d4ac042831..026bd993981 100644
--- a/src/hotspot/cpu/arm/frame_arm.hpp
+++ b/src/hotspot/cpu/arm/frame_arm.hpp
@@ -61,6 +61,7 @@
     // between a callee frame and its stack arguments, where it is part
     // of the caller/callee overlap
     metadata_words_at_top                            = 0,
+    // in bytes
     frame_alignment                                  = 16,
     // size, in words, of maximum shift in frame position due to alignment
     align_wiggle                                     =  1
diff --git a/src/hotspot/cpu/ppc/frame_ppc.hpp b/src/hotspot/cpu/ppc/frame_ppc.hpp
index ebe5d24c072..14743c7d75a 100644
--- a/src/hotspot/cpu/ppc/frame_ppc.hpp
+++ b/src/hotspot/cpu/ppc/frame_ppc.hpp
@@ -402,8 +402,7 @@
     // between a callee frame and its stack arguments, where it is part
     // of the caller/callee overlap
     metadata_words_at_top                  = sizeof(java_abi) >> LogBytesPerWord,
-    // size, in words, of frame metadata at the frame top that needs
-    // to be reserved for callee functions in the runtime
+    // in bytes
     frame_alignment                        = 16,
     frame_alignment_in_words               = frame_alignment >> LogBytesPerWord,
     // size, in words, of maximum shift in frame position due to alignment
diff --git a/src/hotspot/cpu/x86/frame_x86.hpp b/src/hotspot/cpu/x86/frame_x86.hpp
index 2d382c7e5e5..546c40fffe4 100644
--- a/src/hotspot/cpu/x86/frame_x86.hpp
+++ b/src/hotspot/cpu/x86/frame_x86.hpp
@@ -101,8 +101,7 @@
     // between a callee frame and its stack arguments, where it is part
     // of the caller/callee overlap
     metadata_words_at_top                            = 0,
-    // size, in words, of frame metadata at the frame top that needs
-    // to be reserved for callee functions in the runtime
+    // in bytes
     frame_alignment                                  = 16,
     // size, in words, of maximum shift in frame position due to alignment
     align_wiggle                                     =  1
diff --git a/src/hotspot/cpu/zero/frame_zero.hpp b/src/hotspot/cpu/zero/frame_zero.hpp
index af9abe22cbe..19096615594 100644
--- a/src/hotspot/cpu/zero/frame_zero.hpp
+++ b/src/hotspot/cpu/zero/frame_zero.hpp
@@ -39,6 +39,7 @@
     // between a callee frame and its stack arguments, where it is part
     // of the caller/callee overlap
     metadata_words_at_top                            = 0,
+    // in bytes
     frame_alignment  = 16,
     // size, in words, of maximum shift in frame position due to alignment
     align_wiggle     =  1