--- a/doc/Makefile
+++ b/doc/Makefile
@@ -6,9 +6,9 @@
 
 all: html
 
-# generate html documentation with warning as errors
+# generate html documentation with warning not errors
 html:
-	$(SPHINXBUILD) -W -b html . ./_build/html/
+	$(SPHINXBUILD) -b html . ./_build/html/
 
 # remove generated sphinx gallery examples and sphinx documentation
 clean:
