diff --git a/src/flextype/core/Parsers/Shortcodes/StringsShortcode.php b/src/flextype/core/Parsers/Shortcodes/StringsShortcode.php
index 37bc59b2..5d5c314a 100644
--- a/src/flextype/core/Parsers/Shortcodes/StringsShortcode.php
+++ b/src/flextype/core/Parsers/Shortcodes/StringsShortcode.php
@@ -38,7 +38,7 @@ parsers()->shortcodes()->addHandler('strings', static function (ShortcodeInterfa
             if (is_iterable($vars)) {
                 $content = strings($content)->{'append'}(...$vars)->toString();
             } else {
-                $content = strings($content)->{'append'}($vars)->toString();
+                $content = strings($content)->{'append'}($vars[0])->toString();
             }
         }
 
@@ -46,7 +46,7 @@ parsers()->shortcodes()->addHandler('strings', static function (ShortcodeInterfa
             if (is_iterable($vars)) {
                 $content = strings($content)->{'prepend'}(...$vars)->toString();
             } else {
-                $content = strings($content)->{'prepend'}($vars)->toString();
+                $content = strings($content)->{'prepend'}($vars[0])->toString();
             }
         }
 
@@ -149,6 +149,13 @@ parsers()->shortcodes()->addHandler('strings', static function (ShortcodeInterfa
         if ($key == 'firstSegment') {
             $content = strings($content)->{'firstSegment'}(isset($vars[0]) ? (string) $vars[0] : ' ')->toString();
         }
+
+        if ($key == 'format') {
+            $formatVars = isset($vars[0]) ? explode($itemsDelimeter, $vars[0]) : [];
+            if (count($formatVars) > 0) {
+                $content = strings($content)->{'format'}(...$formatVars)->toString();
+            }
+        }
     }
     
     return (string) $content;
diff --git a/tests/src/flextype/core/Parsers/Shortcodes/StringsShortcodeTest.php b/tests/src/flextype/core/Parsers/Shortcodes/StringsShortcodeTest.php
index 7a869ed2..60d55e0b 100644
--- a/tests/src/flextype/core/Parsers/Shortcodes/StringsShortcodeTest.php
+++ b/tests/src/flextype/core/Parsers/Shortcodes/StringsShortcodeTest.php
@@ -98,4 +98,7 @@ test('[strings] shortcode', function () {
     // firstSegment
     $this->assertEquals("SG-1", parsers()->shortcodes()->parse('[strings firstSegment]SG-1 returns from an off-world mission[/strings]'));
     $this->assertEquals("SG", parsers()->shortcodes()->parse('[strings firstSegment="-"]SG-1 returns from an off-world mission[/strings]'));
+
+    // format
+    $this->assertEquals("There are 5 monkeys in the tree", parsers()->shortcodes()->parse('[strings format=5,tree]There are %d monkeys in the %s[/strings]'));
 });
\ No newline at end of file