diff --git a/_docs/README.md b/_docs/README.md
index 035c97f58..a0a0293ba 100644
--- a/_docs/README.md
+++ b/_docs/README.md
@@ -10,6 +10,15 @@
 
 `git subtree push --prefix _docs/public/ origin gh-pages`
 
+## If the above doesn't work, try this:
+
+```
+# https://gist.github.com/cobyism/4730490#gistcomment-1394421
+git subtree split --prefix _docs/public -b gh-pages
+git push -f origin gh-pages:gh-pages
+git branch -D gh-pages
+```
+
 # How to update the version
 
 1. Fix the release date in the HTML
@@ -21,4 +30,4 @@
   2. Generate the doc
   3. Add tag like v1.2.0-rc1
   4. Deploy JavaScript files to github.com/hajimehoshi/ebiten.pagestorage
-  5. Deploy the doc (You might see confliction. Unfortunately, we might have to use git push -f (See https://gist.github.com/cobyism/4730490#gistcomment-1394421))
+  5. Deploy the doc