In this https://github.com/kubernetes/helm/blob/master/Makefile there are targets with a dot in front of them. What is this convention for ?
.PHONY: all
all: build
.PHONY: build
build:
GOBIN=$(BINDIR) $(GO) install $(GOFLAGS) -tags '$(TAGS)' -ldflags '$(LDFLAGS)' k8s.io/helm/cmd/...