diff --git a/firmware/global.h b/firmware/global.h
index 459302cd0f..3ae240e44f 100644
--- a/firmware/global.h
+++ b/firmware/global.h
@@ -76,9 +76,9 @@ typedef VirtualTimer virtual_timer_t;
  * The following obscurantism is a hack to reduce stack usage, maybe even a questionable performance
  * optimization.
  *
- * rusEfi main processing happends on IRQ so PORT_INT_REQUIRED_STACK has to be pretty large. Problem
+ * rusEfi main processing happens on IRQ so PORT_INT_REQUIRED_STACK has to be pretty large. Problem
  * is that PORT_INT_REQUIRED_STACK is included within each user thread stack, thus this large stack multiplies
- * and this consumes a lot of valueable RAM. While forcing the comiler to inline helps to some degree,
+ * and this consumes a lot of valueable RAM. While forcing the compiler to inline helps to some degree,
  * it would be even better not to waste stack on passing the parameter.
  *
  * In the firmware we are using 'extern *Engine' - in the firmware Engine is a signleton
diff --git a/unit_tests/global.h b/unit_tests/global.h
index f62c3f3383..fe409cc446 100644
--- a/unit_tests/global.h
+++ b/unit_tests/global.h
@@ -41,6 +41,9 @@ typedef int bool_t;
 class Engine;
 #endif
 
+/**
+ * @see firmware/global.h for explanation
+ */
 #define DECLARE_ENGINE_PARAMETER_F Engine *engine, engine_configuration_s *engineConfiguration, persistent_config_s *config, board_configuration_s *boardConfiguration
 #define DECLARE_ENGINE_PARAMETER_S , Engine *engine, engine_configuration_s *engineConfiguration, persistent_config_s *config, board_configuration_s *boardConfiguration
 #define PASS_ENGINE_PARAMETER_F engine, engineConfiguration, config, boardConfiguration