diff --git a/cores/arduino/stm32/stm32_def_build.h b/cores/arduino/stm32/stm32_def_build.h
index d131d85361..7f2f7af348 100644
--- a/cores/arduino/stm32/stm32_def_build.h
+++ b/cores/arduino/stm32/stm32_def_build.h
@@ -1,6 +1,7 @@
 #ifndef _STM32_DEF_BUILD_
 #define _STM32_DEF_BUILD_
 
+#ifndef CMSIS_STARTUP_FILE
 #if defined(STM32F030x6)
 #define CMSIS_STARTUP_FILE "startup_stm32f030x6.s"
 #elif defined(STM32F030x8)
@@ -296,4 +297,5 @@
 #else
 #error UNKNOWN CHIP
 #endif
+#endif // CMSIS_STARTUP_FILE undefined
 #endif //_STM32_DEF_BUILD_
diff --git a/package.json b/package.json
new file mode 100644
index 0000000000..c81909ec7a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,7 @@
+{
+    "description":"Arduino STM32 Official Framework (stm32core)",
+    "name":"framework-arduinostm32core",
+    "system":"all",
+    "url":"https://github.com/xC0000005/Arduino_Core_STM32",
+    "version":"1.0.0"
+}