diff --git a/README.md b/README.md
index e51e5c5..b6d123e 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,19 @@
 hello DOSdl
 ===========
-Hello DOSdl is a variant of Wordle / hello wordl for MS-DOS running on IBM PC
-compatible systems.
+Hello DOSdl is a variant of Wordle / hello wordl for MS-DOS 1.25 and later.
+
+Gameplay
+--------
+Gameplay is as in hello wordl's default daily mode. `x` under a letter marks it
+as incorrect and `^` marks it as being in the wrong place.
+
+Missing features
+----------------
+
+- Ability to set the seed manually
+- Hard and extra hard modes
+- In-program help
+- Display of letters that have not been ruled out
 
 Word lists
 ----------