diff --git a/Makefile b/Makefile
index 4b3bfed..2628709 100755
--- a/Makefile
+++ b/Makefile
@@ -38,9 +38,11 @@ SLIDES_MD=$(shell find $(SLIDES_DIR) \( -name '*.md' ! -name '_*' \)) $(SLIDES_M
 SLIDES_MD_PDF=$(patsubst $(SLIDES_DIR)/%.md,$(BUILD_SLIDES_DIR)/%.pdf,$(SLIDES_MD))
 SLIDES_MD_PPTX=$(patsubst $(SLIDES_DIR)/%.md,$(BUILD_SLIDES_DIR)/%.pptx,$(SLIDES_MD))
 
-SLIDES_MD_ALL=$(SLIDES_MDPP_MD) $(SLIDES_MD)
-SLIDES_PDF_ALL=$(SLIDES_MDPP_MD_PDF) $(SLIDES_MD_PDF)
-SLIDES_PPTX_ALL=$(SLIDES_MDPP_MD_PPTX) $(SLIDES_MD_PPTX)
+SLIDES_MD_ALL=$(SLIDES_MDPP_MD) $(SLIDES_MD) $(SLIDES_DIR)/autoslide.md
+SLIDES_PDF_ALL=$(SLIDES_MDPP_MD_PDF) $(SLIDES_MD_PDF) $(BUILD_SLIDES_DIR)/autoslide.pdf
+SLIDES_PPTX_ALL=$(SLIDES_MDPP_MD_PPTX) $(SLIDES_MD_PPTX) $(BUILD_SLIDES_DIR)/autoslide.pptx
+
+DOCS_MD=$(shell find $(DOCS_DIR) \( -name '*.md' ! -name '_*' \))
 
 ## Find .uml graphs
 DOCS_IMAGES_UML=$(shell find $(IMAGES_DIR) \( -name '*.uml' ! -name '_*' \))
@@ -121,7 +123,9 @@ watch: ## run development server
 	$(MAKE) autoslide
 	pipenv run honcho start 
 
-autoslide:
+autoslide: $(SLIDES_DIR)/autoslide.md | $(BUILD_SLIDES_DIR)
+
+$(SLIDES_DIR)/autoslide.md: $(DOCS_MD)
 	find $(DOCS_DIR) -regextype sed -regex '.*/[0-9][^/]*\.md' -print0 \
 		| sort -z |xargs -0 cat \
 		> $(SLIDES_DIR)/autoslide.md