diff --git a/runtime/syntax/Dockerfile.micro b/runtime/syntax/Dockerfile.micro
index 0b9eddea..7bc9fa95 100644
--- a/runtime/syntax/Dockerfile.micro
+++ b/runtime/syntax/Dockerfile.micro
@@ -2,7 +2,7 @@
 syntax "dockerfile" "Dockerfile[^/]*$" "\.dockerfile$"
 
 ## Keywords
-color keyword (i) "^(FROM|MAINTAINER|RUN|CMD|LABEL|EXPOSE|ENV|ADD|COPY|ENTRYPOINT|VOLUME|USER|WORKDIR|ONBUILD)[[:space:]]"
+color keyword (i) "^(FROM|MAINTAINER|RUN|CMD|LABEL|EXPOSE|ENV|ADD|COPY|ENTRYPOINT|VOLUME|USER|WORKDIR|ONBUILD|ARG|HEALTHCHECK|STOPSIGNAL|SHELL)[[:space:]]"
 
 ## Brackets & parenthesis
 color statement "(\(|\)|\[|\])"