diff --git a/README_master.txt b/README_master.txt
new file mode 100644
index 0000000..22403bc
--- /dev/null
+++ b/README_master.txt
@@ -0,0 +1,7 @@
+/*
+  This is the master branch of the "pmt" tree.
+  Individual projects are in separate branches,
+  e.g., pngcrush is in the "pngcrush" branch,
+        pngmeta is in the "pngmeta" branch, and
+        pnguri is in the "pnguri" branch.
+*/
diff --git a/README_pngzop.txt b/README_pngzop.txt
deleted file mode 100644
index e533b39..0000000
--- a/README_pngzop.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-
-/*
-  This is the pngzop branch of the "pmt" tree.
-  Code for supporting the "zopfli" compression method
-  in PNG files will appear here.
-*/