diff --git a/src/makernote_int.cpp b/src/makernote_int.cpp
index e79224a3..22845625 100644
--- a/src/makernote_int.cpp
+++ b/src/makernote_int.cpp
@@ -1143,8 +1143,8 @@ namespace Exiv2 {
         { 0x00a8, "0107",    0, 3,  NA },
         { 0x00a8, "0108",    0, 3,  NA },
         // NikonAf
-        { 0x00b7, "0100",   30, 0,  NA },
-        { 0x00b7, "0101",   84, 1,  NA },
+        { 0x00b7, "0100",   30, 0,  NA }, // These sizes have been found in tiff headers of MN
+        { 0x00b7, "0101",   84, 1,  NA }, // tag 0xb7 in sample image metadata for each version
     };
 
     int nikonSelector(uint16_t tag, const byte* pData, uint32_t size, TiffComponent* const /*pRoot*/)