diff --git a/scripts/fix-geo-links.sh b/scripts/fix-geo-links.sh
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+#!/bin/bash
+
+# -----------------------------------------------------------------------------
+# Script Name: fix-geo-links.sh
+#
+# Description:
+#   Each built page includes a <link rel="alternate" type="text/markdown">
+#   tag pointing AI bots/crawlers (GEO — Generative Engine Optimization) at
+#   the raw Markdown source for that page, e.g.:
+#     <link rel="alternate" type="text/markdown"
+#           href="https://github.com/google/transit/raw/main/docs/en/...md">
+#   This URL is built from each config/<lang>/mkdocs.yml's `repo_url`, which
+#   is still set to the old google/transit repo (kept for the "Edit this
+#   page" link and GitHub icon). Since the actual docs/<lang>/ source now
+#   lives in MobilityData/gtfs.org, the generated raw-content URL 404s. This
+#   script rewrites that URL (only) to point at MobilityData/gtfs.org across
+#   all built HTML files, so bots can actually fetch the Markdown.
+#
+# What it does:
+#   - Takes the built site's base directory as an argument.
+#   - Finds all .html files under that directory (recursively, all languages).
+#   - Replaces every occurrence of the old raw-content base URL
+#     (https://github.com/google/transit/raw/main/docs) with the new one
+#     (https://github.com/MobilityData/gtfs.org/raw/main/docs).
+#
+# Works on both the Ubuntu server (GNU sed) and macOS (BSD sed), which
+# require different `-i` invocations — see the OS check below.
+#
+# Usage:
+#   ./fix-geo-links.sh /path/to/built/site
+# -----------------------------------------------------------------------------
+
+# Exit if no argument provided
+if [ -z "$1" ]; then
+  echo "Usage: $0 /path/to/base/dir"
+  exit 1
+fi
+
+# URLs
+OLD_BASE="https://github.com/google/transit/raw/main/docs"
+NEW_BASE="https://github.com/MobilityData/gtfs.org/raw/main/docs"
+
+# Get base directory from argument
+BASE_DIR="${1%/}"
+
+# GNU sed (Linux) accepts `-i` directly; BSD sed (macOS) requires an explicit
+# (empty) backup-extension argument right after -i.
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  SED_INPLACE=(-i '')
+else
+  SED_INPLACE=(-i)
+fi
+
+# Escape regex metacharacters (., in this case) so OLD_BASE is matched
+# literally rather than as a sed pattern.
+OLD_BASE_ESCAPED=$(printf '%s' "$OLD_BASE" | sed -e 's/[]\/$*.^[]/\\&/g')
+
+# Replace all instances of OLD_BASE with NEW_BASE in BASE_DIR
+find "$BASE_DIR" -name "*.html" -type f -exec sed "${SED_INPLACE[@]}" "s|${OLD_BASE_ESCAPED}|${NEW_BASE}|g" {} +
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