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-rw-r--r--ports/esp8266/README.md8
1 files changed, 8 insertions, 0 deletions
diff --git a/ports/esp8266/README.md b/ports/esp8266/README.md
index f4dddd1ca..5f0ad8073 100644
--- a/ports/esp8266/README.md
+++ b/ports/esp8266/README.md
@@ -34,6 +34,14 @@ run `make` in its directory to build and install the SDK locally. Make sure
to add toolchain bin directory to your PATH. Read esp-open-sdk's README for
additional important information on toolchain setup.
+Travis builds, including releases are actually built using a specific
+esp-open-sdk binary. The location of the binary can be seen in the
+`.travis.yml` in the top-level directory of CircuitPython. This may be ahead
+of or behind the pfalcon repository, depending on the specific needs of
+CircuitPython. If your local system is binary-compatible with Travis
+(most Ubuntu and Debian based systems are), you can download the binary and
+skip building it locally.
+
Add the external dependencies to the MicroPython repository checkout:
```bash
$ git submodule update --init