diff --git a/make/README b/make/README
index 3f22bde7..12a20184 100644
--- a/make/README
+++ b/make/README
@@ -1,6 +1,10 @@
 README
 
-The SDK uses 'make' of esp-idf and information of esp-idf is following:
+The SDK uses 'make' of esp-idf, and changed things are following:
+
+1. remove the "toolchain" warning in file project.mk at line 543
+
+Information of esp-idf is following:
 
 URL: https://github.com/espressif/esp-idf
 tag: v3.1-dev
diff --git a/make/project.mk b/make/project.mk
index a15b7d30..52a88d7b 100644
--- a/make/project.mk
+++ b/make/project.mk
@@ -540,7 +540,7 @@ $(info Expected to see version(s): $(SUPPORTED_TOOLCHAIN_GCC_VERSIONS))
 $(info Please check ESP-IDF setup instructions and update the toolchain, or proceed at your own risk.)
 endif
 else
-$(info WARNING: Failed to find Xtensa toolchain, may need to alter PATH or set one in the configuration menu)
+#$(info WARNING: Failed to find Xtensa toolchain, may need to alter PATH or set one in the configuration menu)
 endif # TOOLCHAIN_COMMIT_DESC
 
 endif #MAKE_RESTARTS