diff --git a/arch/i386/unistd_ilp.h b/arch/i386/unistd_ilp.h
index 8f77714..63a266e 100644
--- a/arch/i386/unistd_ilp.h
+++ b/arch/i386/unistd_ilp.h
@@ -1,6 +1,9 @@
 #ifndef _ARCH_UNISTD_ILP_H
 #define _ARCH_UNISTD_ILP_H
 
+/*
+  32-bit ISA, 32-bit int, long, pointer, and offset_t
+*/
 #define _POSIX_V6_ILP32_OFF32 1
 #define _POSIX_V7_ILP32_OFF32 1