diff --git a/make-includes/build_content_rules.make b/make-includes/build_content_rules.make
index bc69e60..b891e8c 100755
--- a/make-includes/build_content_rules.make
+++ b/make-includes/build_content_rules.make
@@ -148,9 +148,12 @@
 # Debugging information, mostly lists of the generated variables.
 #
 debug:
+	@announce Externally defined variables
+	@echo "TEACHING_SHARED = [$(TEACHING_SHARED)]"
+	@echo "BUILD_DIR = [$(BUILD_DIR)]"
+	@announce Internally defined variables
 	@echo "GLOBAL_HANDBOOK_INCLUDE = [$(GLOBAL_HANDBOOK_INCLUDE)]"
 	@echo "LOCAL_HANDBOOK_INCLUDE = [$(LOCAL_HANDBOOK_INCLUDE)]"
-	@echo "BUILD_DIR = [$(BUILD_DIR)]"
 
 
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