diff --git a/.github/hooks/README.md b/.github/hooks/README.md
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+++ b/.github/hooks/README.md
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+# Git Hooks
+These work even on Windows because of Git Bash.
+
+## Setup
+`git config core.hooksPath .github/hooks`
diff --git a/.github/hooks/post-checkout b/.github/hooks/post-checkout
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index 000000000..12358c998
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+++ b/.github/hooks/post-checkout
@@ -0,0 +1,2 @@
+#!/bin/sh
+git submodule update --init --recursive
diff --git a/.github/hooks/post-merge b/.github/hooks/post-merge
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+++ b/.github/hooks/post-merge
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+#!/bin/sh
+git submodule update --init --recursive
diff --git a/.github/hooks/pre-push b/.github/hooks/pre-push
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index 000000000..ec4c820ac
--- /dev/null
+++ b/.github/hooks/pre-push
@@ -0,0 +1,5 @@
+#!/bin/sh
+if git diff --cached --submodule | grep -q "^+"; then
+  echo "WARNING: You have unpushed changes in submodules."
+  exit 1
+fi