diff --git a/README.md b/README.md
index d0e98ee..90d0db2 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # FastLED-idf & Patterns
 
+# WARNING! Currently known to crash with ESP-IDF 4.1, issue #15 under investigation
+
 # TL;DR
 
 This port of FastLED 3.3 runs under the 4.x ESP-IDF development environment. Enjoy.