1 files changed, 2 insertions, 0 deletions
diff --git a/src/tusb.h b/src/tusb.h
index 411b6e08b..8b0dd103c 100644
--- a/src/tusb.h
+++ b/src/tusb.h
@@ -113,6 +113,8 @@
  *  @{ */
 
 // Initialize device/host stack
+// Note: when using with RTOS, this should be called after scheduler/kernel is started.
+// Otherwise it could cause kernel issue since USB IRQ handler does use RTOS queue API.
 bool tusb_init(void);
 
 // Check if stack is initialized