diff --git a/lib/make/mb_os.mk b/lib/make/mb_os.mk
index 50b9978..a6ca5db 100644
--- a/lib/make/mb_os.mk
+++ b/lib/make/mb_os.mk
@@ -27,6 +27,7 @@ MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_RM,"
 MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_RMDIR,"Native OS remove folder command.")
 MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_MKDIR,"Native OS create folder command.")
 MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_COPY,"Native OS copy command.")
+MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_ECHO,"Native OS echo command.")
 MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_ERRIGNORE,"Native OS error to ignore redirect.")
 MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_SEP,"Native OS path seperator.")
 MB_DOC_FIRE_VARIABLE_ROCK += $(call mb_make_call,mb_doc_variable_rock,MB_OS_CACHE,"Native OS application cache folder.")