diff --git a/README.md b/README.md
index 8b91f12..80f29af 100644
--- a/README.md
+++ b/README.md
@@ -283,7 +283,8 @@ NOTE: There are now 2 versions of the TTGO T-BEAM, the first version (Rev0) and
 
 The specific details for adding a Mapper or Cargo integration use a different edge node device than the one detailed here. When prompted to add a function decoder, be sure to use the following decoder. Note: This decoder can also be found within this project in the console-decoders directory.
 
-5. Open this project file ```main/main.ino``` with the Arduino IDE Verify/Compile the project. If the compile is successful upload the application to your TTGO T-Beam.
+~~5. Open this project file ```main/main.ino``` with the Arduino IDE Verify/Compile the project. If the compile is successful upload the application to your TTGO T-Beam.~~
+Filenames with `.ino` are a holdover from Arduino IDE.  Do not use Arduino IDE to compile this build; use PlatformIO instead.
 
 6. Disconnect and turn on the device and once a GPS lock is acquired, the device should start sending data to the Helium network and Helium Mapper or Helium Cargo depending upon which you configured in step 6.