We have a bunch of -help targets so this will save some cognitive
dissonance. Keep the original for those with muscle memory.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/docker/Makefile.include | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index bdc53ddfcf..a5c1e4a615 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -1,6 +1,6 @@
 # Makefile for Docker tests
 
-.PHONY: docker docker-test docker-clean docker-image docker-qemu-src
+.PHONY: docker docker-help docker-test docker-clean docker-image docker-qemu-src
 
 NULL :=
 SPACE := $(NULL) #
@@ -218,6 +218,8 @@ endif
 	@echo '                         Specify which container engine to run.'
 	@echo '    REGISTRY=url         Cache builds from registry (default:$(DOCKER_REGISTRY))'
 
+docker-help: docker
+
 # This rule if for directly running against an arbitrary docker target.
 # It is called by the expanded docker targets (e.g. make
 # docker-test-foo@bar) which will do additional verification.
-- 
2.20.1