diff --git a/include/cpuinfo_x86.h b/include/cpuinfo_x86.h
index 46a9b73..66b06ba 100644
--- a/include/cpuinfo_x86.h
+++ b/include/cpuinfo_x86.h
@@ -76,7 +76,7 @@ typedef struct {
   int avx512bitalg : 1;
   int avx512vpopcntdq : 1;
   int avx512_4vnniw : 1;
-  int avx512_4vbmi2 : 1;
+  int avx512_4vbmi2 : 1;  // Note: this is an alias to avx512_4fmaps.
   int avx512_second_fma : 1;
   int avx512_4fmaps : 1;
   int avx512_bf16 : 1;
@@ -227,7 +227,7 @@ typedef enum {
   X86_AVX512BITALG,
   X86_AVX512VPOPCNTDQ,
   X86_AVX512_4VNNIW,
-  X86_AVX512_4VBMI2,
+  X86_AVX512_4VBMI2,  // Note: this is an alias to X86_AVX512_4FMAPS.
   X86_AVX512_SECOND_FMA,
   X86_AVX512_4FMAPS,
   X86_AVX512_BF16,