diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index 176280fa..1dee6b8b 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -35,6 +35,8 @@ R -e 'devtools::document()'
 R -e 'pkgdown::build_site(lazy = TRUE, examples = FALSE, devel = TRUE, preview = FALSE)'
 ```
 
+Note that sometimes the caches from either `pkgdown` or `knitr` can cause difficulties. To clear those, run `make`, with either `clean_knitr`, `clean_site`, or `clean` (which does both).
+
 If you work without R Studio and want to iterate on documentation, you might
 find `Rscript inst/pkgdown-watch.R` helpful to keep a live updating version of the website. Note that you need to have `c("pkgdown", "servr", "devtools", "here", "cli", "fs")` installed.
 
diff --git a/Makefile b/Makefile
new file mode 100644
index 00000000..9f5790ac
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+##
+# epipredict docs build
+#
+
+# knitr doesn't actually clean it's own cache properly; this just deletes any of
+# the article knitr caches in vignettes or the base
+clean_knitr:
+	rm -r *_cache; rm -r vignettes/*_cache
+clean_site:
+	Rscript -e "pkgdown::clean_cache(); pkgdown::clean_site()"
+# this combines 
+clean: clean_knitr clean_site
+
+# end
diff --git a/man/figures/README-show-single-forecast-1.png b/man/figures/README-show-single-forecast-1.png
index 4017b2a1..13e66fd4 100644
Binary files a/man/figures/README-show-single-forecast-1.png and b/man/figures/README-show-single-forecast-1.png differ