diff --git a/2019/README.text b/2019/README.md
similarity index 100%
rename from 2019/README.text
rename to 2019/README.md
diff --git a/2020/README.text b/2020/README.md
similarity index 100%
rename from 2020/README.text
rename to 2020/README.md
diff --git a/years-spoiler.html b/years-spoiler.html
index ad3cc9cbb..d6277752e 100644
--- a/years-spoiler.html
+++ b/years-spoiler.html
@@ -38,7 +38,7 @@ Contest </I></FONT></CENTER>
 <LI><A HREF="2020/2020.tar.bz2">2020.tar.bz2</A>  - all of the data for 2020 (938 Kib)
 <LI><A HREF="2020/MANIFEST">MANIFEST</A>
 <LI><A HREF="2020/Makefile">Makefile</A>
-<LI><A HREF="2020/README.text">README.text</A>
+<LI><A HREF="2020/README.md">README.md</A>
 <LI><A HREF="2020/guidelines.txt">guidelines.txt</A>
 <LI><A HREF="2020/iocccsize-test.sh">iocccsize-test.sh</A>
 <LI><A HREF="2020/iocccsize.c">iocccsize.c</A>
@@ -268,7 +268,7 @@ Contest </I></FONT></CENTER>
 <LI><A HREF="2019/MANIFEST">MANIFEST</A>
 <LI><A HREF="2019/Makefile">Makefile</A>
 <LI><A HREF="2019/README.html">README.html</A>
-<LI><A HREF="2019/README.text">README.text</A>
+<LI><A HREF="2019/README.md">README.md</A>
 <LI><A HREF="2019/guidelines.txt">guidelines.txt</A>
 <LI><A HREF="2019/hint.css">hint.css</A>
 <LI><A HREF="2019/iocccsize.c">iocccsize.c</A>
diff --git a/years.html b/years.html
index 5fb84d1e6..b92a3184d 100644
--- a/years.html
+++ b/years.html
@@ -45,7 +45,7 @@ a summary description of all of the winners.  </P>
 <LI><A HREF="2020/2020.tar.bz2">2020.tar.bz2</A>  - all of the data for 2020 (938 Kib)
 <LI><A HREF="2020/MANIFEST">MANIFEST</A>
 <LI><A HREF="2020/Makefile">Makefile</A>
-<LI><A HREF="2020/README.text">README.text</A>
+<LI><A HREF="2020/README.md">README.md</A>
 <LI><A HREF="2020/guidelines.txt">guidelines.txt</A>
 <LI><A HREF="2020/iocccsize-test.sh">iocccsize-test.sh</A>
 <LI><A HREF="2020/iocccsize.c">iocccsize.c</A>
@@ -275,7 +275,7 @@ a summary description of all of the winners.  </P>
 <LI><A HREF="2019/MANIFEST">MANIFEST</A>
 <LI><A HREF="2019/Makefile">Makefile</A>
 <LI><A HREF="2019/README.html">README.html</A>
-<LI><A HREF="2019/README.text">README.text</A>
+<LI><A HREF="2019/README.md">README.md</A>
 <LI><A HREF="2019/guidelines.txt">guidelines.txt</A>
 <LI><A HREF="2019/hint.css">hint.css</A>
 <LI><A HREF="2019/iocccsize.c">iocccsize.c</A>