diff --git a/tools/build/options/WITH_BEARSSL b/tools/build/options/WITH_BEARSSL
index 9dcebbf1ae3..ff443a20586 100644
--- a/tools/build/options/WITH_BEARSSL
+++ b/tools/build/options/WITH_BEARSSL
@@ -9,7 +9,7 @@ signature verification and related operations
 for Verified Exec and
 .Xr loader 8 .
 .Pp
-Due to size constraints, one may need to set
+Due to size constraints in the BIOS environment on x86, one may need to set
 .Va LOADERSIZE
 larger than the
 default 500000, although often loader is under the 500k limit even with
diff --git a/tools/build/options/WITH_LOADER_PXEBOOT b/tools/build/options/WITH_LOADER_PXEBOOT
index 01d4a0b86a6..37cf1fa254e 100644
--- a/tools/build/options/WITH_LOADER_PXEBOOT
+++ b/tools/build/options/WITH_LOADER_PXEBOOT
@@ -1,4 +1,4 @@
-Build pxeboot on i386/amd64.
+Build pxeboot on i386/amd64 for BIOS booting.
 The PXE Boot loader package needs more space than we may have in the boot loader.
 If you need to increase
 .Va LOADERSIZE