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diff --git a/README.md b/README.md
index bf87f9b..8bf9da1 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,15 @@ Written in Turbo Pascal 7.
 
 Pull requests welcome!
 
+### Building
+
+You need Turbo Pascal 7 (earlier versions may work):
+
+```
+tpc dosfetch
+
+```
+
 ### Copying
 
 Written by Leah Neukirchen <leah@vuxu.org>