diff --git a/Makefile b/Makefile
index 2ab267c..1aa720f 100755
--- a/Makefile
+++ b/Makefile
@@ -225,7 +225,7 @@ build-docs-pdf:  ## build pdf docs only
             --site-dir $(BUILD_DOCS_DIR)
 	pdftk \
 		$$(find $(BUILD_DOCS_DIR) -name *.pdf -not -name index.pdf |sort ) \
-        cat output $(BUILD_DOCS_DIR)/combined.pdf
+        cat output $(BUILD_DOCS_DIR)/docs.pdf
 
 build-docs-html:  ## build static docs site only
 	mkdir -p $(BUILD_DOCS_DIR)