diff --git a/lang/README.md b/lang/README.md
new file mode 100644
index 00000000..ef696635
--- /dev/null
+++ b/lang/README.md
@@ -0,0 +1,19 @@
+### how to update
+
+1. find missing keys:
+
+```sh
+MINE=<your-lang>.json
+BASE=en-US.json
+
+jq 'keys' < $BASE > base
+jq 'keys' < $MINE > mine
+
+diff -c2 base mine
+# will print missing keys.
+# add them to $MINE
+```
+
+2. for each key, search in your editor where it is used, and additionally visit the [live demo website](https://app.umami.is/share/8rmHaheU/umami.is), to better understand the usage context.
+
+3. translate. though, if you don't fully understand the context of how a translation is used, note this in the PR review.
diff --git a/lang/lt-LT.json b/lang/lt-LT.json
index 3b804fa2..409409dc 100644
--- a/lang/lt-LT.json
+++ b/lang/lt-LT.json
@@ -62,6 +62,7 @@
   "label.username": "Vartotojo vardas",
   "label.view-details": "Peržiūrėti detaliau",
   "label.websites": "Svetainės",
+  "label.yesterday": "Vakar",
   "message.active-users": "{x, plural, =0 {# aktyvių vartotojų} zero {# aktyvių vartotojų} one {# aktyvus vartotojas} other {# aktyvūs vartotojai}}",
   "message.confirm-delete": "Ar esate tikri, jog norite ištrinti svetainę {target}?",
   "message.confirm-reset": "Are esate tikri, jog norite atstatyti svetainės {target} statistikos duomenis?",