diff --git a/make/projects-dir.mk b/make/projects-dir.mk
index ab8e484c..364e9b81 100644
--- a/make/projects-dir.mk
+++ b/make/projects-dir.mk
@@ -1,3 +1,14 @@
+#
+# This is the toplevel Makefile for a janware GmbH software build tree. It is
+# provided under the terms of the Gnu Lesser Public License, Version 2.
+#
+# You will need a janware.com user account for pretty much anything this
+# Makefile does. Ask admin@janware.com if you want one.
+#
+# Run "make doc-project" or check https://janware.com/wiki/pub/en:sw:build:
+# for some on-line documentation of how this is meant to work.
+#
+
 # ------------ makefile and environment variables
 
 ifneq ($(PROJECTS),)
@@ -89,7 +100,7 @@ echo-prereq-release:
 	@$(PROJECTS_PY) required-pkg --flavour release $(BUILD_PROJECTS)
 
 doc-project doc-module:
-	$(BROWSER) https://janware.com/wiki/pub/sw:build:
+	$(BROWSER) $(firstword $(shell sed '/https:/ !d; s%.*https%https%; s/ .*//' $(firstword $(MAKEFILE_LIST))))
 
 pkg-%: pull.done
 	$(BUILD_PY) $@ $(BUILD_PROJECTS)