diff --git a/expat/tests/Makefile.am b/expat/tests/Makefile.am
index c38c4309..ff192381 100644
--- a/expat/tests/Makefile.am
+++ b/expat/tests/Makefile.am
@@ -92,7 +92,7 @@ EXTRA_DIST = \
     structdata.h \
     minicheck.h \
     memcheck.h \
-    README.txt \
+    README.md \
     udiffer.py \
     xmltest.log.expected \
     xmltest.sh
diff --git a/expat/tests/README.md b/expat/tests/README.md
new file mode 100644
index 00000000..010ca95e
--- /dev/null
+++ b/expat/tests/README.md
@@ -0,0 +1,11 @@
+This directory contains the test suite for Expat.  The tests provide
+general unit testing and regression coverage.  The tests are not
+expected to be useful examples of Expat usage; see the
+[examples](../examples) directory for that.
+
+The Expat tests use a partial internal implementation of the
+[Check](https://libcheck.github.io/check/) unit testing framework for
+C.
+
+Expat must be built and, on some platforms, installed, before the
+tests can be run.
diff --git a/expat/tests/README.txt b/expat/tests/README.txt
deleted file mode 100644
index 30e1d4da..00000000
--- a/expat/tests/README.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-This directory contains the (fledgling) test suite for Expat.  The
-tests provide general unit testing and regression coverage.  The tests
-are not expected to be useful examples of Expat usage; see the
-examples/ directory for that.
-
-The Expat tests use a partial internal implementation of the "Check"
-unit testing framework for C. More information on Check can be found at:
-
-        http://check.sourceforge.net/
-
-Expat must be built and, depending on platform, must be installed, before "make check" can be executed.
-
-This test suite can all change in a later version.
diff --git a/expat/win32/expat.iss b/expat/win32/expat.iss
index 2a4c87e6..2c9e9215 100644
--- a/expat/win32/expat.iss
+++ b/expat/win32/expat.iss
@@ -96,7 +96,7 @@ Flags: ignoreversion; Source: examples\*.c;                 DestDir: "{app}\Sour
 Flags: ignoreversion; Source: tests\*.c;                    DestDir: "{app}\Source\tests"
 Flags: ignoreversion; Source: tests\*.cpp;                  DestDir: "{app}\Source\tests"
 Flags: ignoreversion; Source: tests\*.h;                    DestDir: "{app}\Source\tests"
-Flags: ignoreversion; Source: tests\README.txt;             DestDir: "{app}\Source\tests"
+Flags: ignoreversion; Source: tests\README.md;              DestDir: "{app}\Source\tests"
 Flags: ignoreversion; Source: tests\benchmark\*.c;          DestDir: "{app}\Source\tests\benchmark"
 Flags: ignoreversion; Source: tests\benchmark\README.txt;   DestDir: "{app}\Source\tests\benchmark"
 Flags: ignoreversion; Source: xmlwf\*.c*;                   DestDir: "{app}\Source\xmlwf"