diff --git a/GNUmakefile b/GNUmakefile
index f5788e0..144e67b 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -100,7 +100,7 @@ install-data:
 
 install-docs:
 	install -m 755 -d -- $(DESTDIR)$(DOCSDIR)
-	install -c -m 644 README $(DESTDIR)$(DOCSDIR)/README
+	install -c -m 644 README.md $(DESTDIR)$(DOCSDIR)/README.md
 	install -c -m 644 RELEASE-NOTES $(DESTDIR)$(DOCSDIR)/RELEASE-NOTES
 	install -c -m 644 doc/RETRO-Book.md $(DESTDIR)$(DOCSDIR)/RETRO-Book.md
 	install -c -m 644 doc/words.tsv $(DESTDIR)$(DOCSDIR)/words.tsv
diff --git a/Makefile b/Makefile
index 976d57f..db9a62d 100644
--- a/Makefile
+++ b/Makefile
@@ -94,7 +94,7 @@ install-data:
 
 install-docs:
 	install -m 755 -d -- $(DESTDIR)$(DOCSDIR)
-	install -c -m 644 README $(DESTDIR)$(DOCSDIR)/README
+	install -c -m 644 README.md $(DESTDIR)$(DOCSDIR)/README.md
 	install -c -m 644 RELEASE-NOTES $(DESTDIR)$(DOCSDIR)/RELEASE-NOTES
 	install -c -m 644 doc/RETRO-Book.md $(DESTDIR)$(DOCSDIR)/RETRO-Book.md
 	install -c -m 644 doc/words.tsv $(DESTDIR)$(DOCSDIR)/words.tsv