diff --git a/nnfc.awk b/nnfc.awk
index 5419a24..67d9ad3 100644
--- a/nnfc.awk
+++ b/nnfc.awk
@@ -1,5 +1,11 @@
 # no-nonsense FreeCell
 # run as: [n]awk -f nnfc.awk [-v ASCII=1] [-v MONOCHROME=1] [-v SEED=x]
+# commands: q - quit, u - undo,
+# [number] [number] - move from column/freecell to column/freecell/foundation:
+# - 0 is foundation (can be omitted)
+# - 1 to 8 are column numbers
+# - 9 to 12 are freecell numbers
+# SEED variable can be used to init games M$-style
 # created by Luxferre in 2024, released into public domain
 
 # Helper functions