diff --git a/src/common/inttypes.h b/src/common/inttypes.h
index a36543e63..0d8caf32a 100644
--- a/src/common/inttypes.h
+++ b/src/common/inttypes.h
@@ -38,7 +38,8 @@
 
 
 
-/* If we have <stdint.h>, include it; otherwise, adapt types from <stddef.h>.
+/* If we have <stdint.h>, include it; otherwise, adapt types from <stddef.h>
+** and define integer boundary constants.
 ** gcc and msvc don't define __STDC_VERSION__ without special flags, so check
 ** for them explicitly.  Undefined symbols are replaced by zero; so, checks for
 ** defined(__GNUC__) and defined(_MSC_VER) aren't necessary.