diff --git a/.gitignore b/.gitignore
index cf89f87..8abdc28 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,5 +9,8 @@
 # html files (as generated from markdown)
 *.html
 
+# checksums file as used by $ScriptInstallUpdate
+checksums.json
+
 # Mac OS X folder settings file
 .DS_Store
diff --git a/Makefile b/Makefile
index d21713c..8951741 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ WIFI = $(wildcard *.wifi.rsc)
 MARKDOWN = $(wildcard *.md doc/*.md doc/mod/*.md)
 HTML = $(MARKDOWN:.md=.html)
 
-all: $(CAPSMAN) $(LOCAL) $(WIFI) $(HTML)
+all: $(CAPSMAN) $(LOCAL) $(WIFI) $(HTML) checksums.json
 
 %.html: %.md Makefile
 	markdown $< | sed 's/href="\([-_\./[:alnum:]]*\)\.md"/href="\1.html"/g' > $@
@@ -32,5 +32,8 @@ all: $(CAPSMAN) $(LOCAL) $(WIFI) $(HTML)
 		-e '/^# !!/,/^# !!/c # !! Do not edit this file, it is generated from template!' \
 		< $< > $@
 
+checksums.json: contrib/checksums.sh *.rsc */*.rsc
+	contrib/checksums.sh
+
 clean:
-	rm -f $(HTML)
+	rm -f $(HTML) checksums.json
diff --git a/contrib/checksums.sh b/contrib/checksums.sh
new file mode 100755
index 0000000..b472b49
--- /dev/null
+++ b/contrib/checksums.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# generate a checksums file as used by $ScriptInstallUpdate
+
+set -e
+
+md5sum $(find -name '*.rsc' | sort) | \
+	sed -e "s| \./||" -e 's|.rsc$||' | \
+	jq --raw-input --null-input '[ inputs | split (" ") | { (.[1]): (.[0]) }] | add' > 'checksums.json'