--- /dev/null
+This example requires that gr-audio-alsa be built in the main tree in order
+to compile successfully. It is not built automatically.
+
+To build this example, you must make two modifications to the build system:
+
+1) Add the following line inside config/grc_gnuradio_examples.m4:
+
+ gnuradio-examples/c++/dial_tone/Makefile
+
+ ...to the list of Makefiles already in there.
+
+2) In gnuradio-examples/c++/Makefile.am, uncomment the SUBDIRS line
+
+# SUBDIRS = dial_tone
+
+Then, from the top-level directory, re-run ./bootstrap and ./configure.
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