diff --git a/docs/docs/string_formatting.md b/docs/docs/string_formatting.md
index 91b95fc4..a00611e0 100644
--- a/docs/docs/string_formatting.md
+++ b/docs/docs/string_formatting.md
@@ -140,6 +140,7 @@ The following tokens are currently supported:
 |                                | SSSS ...      | 000[0..] 001[0..] ... 998[0..] 999[0..]    |
 |                                | SSSSSS        |                                            |
 | **AM / PM**                    | A             | AM, PM                                     |
+|                                | a             | am, pm                                     |
 | **Timezone**                   | Z             | -07:00, -06:00 ... +06:00, +07:00          |
 |                                | ZZ            | -0700, -0600 ... +0600, +0700              |
 |                                | z             | Asia/Baku, Europe/Warsaw, GMT ...          |
diff --git a/src/pendulum/formatting/formatter.py b/src/pendulum/formatting/formatter.py
index b09977d0..dfebc363 100644
--- a/src/pendulum/formatting/formatter.py
+++ b/src/pendulum/formatting/formatter.py
@@ -355,6 +355,14 @@ def _format_localizable_token(
                 key += ".am"
 
             return cast("str", locale.get(key))
+        elif token == "a":
+            key = "translations.day_periods"
+            if dt.hour >= 12:
+                key += ".pm"
+            else:
+                key += ".am"
+
+            return cast("str", locale.get(key)).lower()
         else:
             return token
 
diff --git a/tests/formatting/test_formatter.py b/tests/formatting/test_formatter.py
index b83b67be..5e19187d 100644
--- a/tests/formatting/test_formatter.py
+++ b/tests/formatting/test_formatter.py
@@ -140,6 +140,13 @@ def test_am_pm():
     assert f.format(d.set(hour=11), "A") == "AM"
 
 
+def test_am_pm_lowercase():
+    f = Formatter()
+    d = pendulum.datetime(2016, 8, 28, 23)
+    assert f.format(d, "a") == "pm"
+    assert f.format(d.set(hour=11), "a") == "am"
+
+
 def test_hour():
     f = Formatter()
     d = pendulum.datetime(2016, 8, 28, 7)