diff --git a/README.md b/README.md
index 3df22fa..e7cd254 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,9 @@ System requirements
 - MS-DOS 1.25 or later, or PC-DOS 1.1 or later
 - 64KiB of RAM
 
+Notably, hello DOSdl has been written to only use the DOS APIs, meaning it
+should work on non-PC DOS platforms as well.
+
 Gameplay
 --------
 Gameplay is as in hello wordl's default daily mode. `x` under a letter marks it