diff --git a/io.hpp b/io.hpp
index 7918134..508fe47 100644
--- a/io.hpp
+++ b/io.hpp
@@ -130,10 +130,10 @@ namespace detail {
 The following works in avr-gcc 5.4.0, but is not legal C++, because ptr's are not legal constexpr's:
   constexpr auto *foo = ptr;
 
-Workaround is to store the the address of the ptr in a uintptr_t and reinterpret_cast it at call site.
+Workaround is to store the address of the ptr in a uintptr_t and reinterpret_cast it at call site.
 The _SFR_ADDR macro in sfr_defs.h would give the address, but it does that by taking the address of the dereferenced
 pointer and casts it to uint16_t, which is still not a legal constexpr.
-The workaround therefore is to disable the pointer cast and dereference macro _MMIO_BYTE temporarily.
+The workaround therefore is to disable the pointer-cast-and-dereference macro _MMIO_BYTE temporarily.
 */
 
 #pragma push_macro("_MMIO_BYTE")