diff --git a/use-fork.sh b/use-fork.sh
new file mode 100644
index 000000000..06a4838b3
--- /dev/null
+++ b/use-fork.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+# See doc/developers.adoc for purposes of this script
+
+# Got to the root of project (where this script itself is located)
+cd `dirname "$0"`
+
+# Determine sub-type
+RUNTIME=""
+if [[ $1 == "runtime" ]]; then
+  RUNTIME="runtime_"
+  cd runtime
+  shift
+fi
+
+if [[ $# -lt 2 ]]; then
+  echo "Updates submodule in the project to you fork"
+  echo "See doc/developers.adoc or https://doc.kaitai.io/developers.html#_developing_new_feature"
+  echo "Usage:"
+  echo "  $0 [runtime] <PROJECT> <GitHub user> [<branch in you GitHub repository>]"
+  exit 2
+fi
+
+PROJECT=$1
+GH_USER=$2
+BRANCH=$3
+URL="https://github.com/${GH_USER}/kaitai_struct_${RUNTIME}${PROJECT}.git"
+
+BRANCH_TITLE="${BRANCH}"
+if [[ "${BRANCH}" -eq "" ]]; then
+  BRANCH_TITLE="<all>"
+fi
+
+echo "Project    : ${PROJECT}"
+echo "GitHub User: ${GH_USER}"
+echo "Branch     : ${BRANCH_TITLE}"
+echo "Repository : ${URL}"
+echo `pwd`
+
+# Select subproject you want to modify
+cd ${PROJECT}
+# Add your repository as remote with name my-repo
+git remote add ${GH_USER} ${URL}
+
+if [[ "${BRANCH}" -eq "" ]]; then
+  # Get you work
+  git fetch ${GH_USER}
+else
+  # Get you work
+  git fetch ${GH_USER} ${BRANCH}
+  # Switch to you feature branch
+  git checkout ${BRANCH}
+fi