diff --git a/public_html/templates/help.tpl b/public_html/templates/help.tpl
index e804e765..58e56a4a 100644
--- a/public_html/templates/help.tpl
+++ b/public_html/templates/help.tpl
@@ -123,6 +123,7 @@
                     {search: 'date:2000-01-01', description: 'posted on January 1st, 2000'},
                     {search: 'id:1', description: 'having specific post ID'},
                     {search: 'name:<em>hash</em>', description: 'having specific post name (hash in full URLs)'},
+                    {search: 'file_size:100..', description: 'having at least 100 bytes'},
                     {search: 'image_width:100..', description: 'being at least 100 pixels wide'},
                     {search: 'image_height:100..', description: 'being at least 100 pixels tall'},
                     {search: 'image_area:10000..', description: 'having at least 10000 pixels'},
diff --git a/src/Search/Filters/PostFilter.php b/src/Search/Filters/PostFilter.php
index ade8fce8..f839c3eb 100644
--- a/src/Search/Filters/PostFilter.php
+++ b/src/Search/Filters/PostFilter.php
@@ -38,6 +38,7 @@ class PostFilter extends BasicFilter implements IFilter
     const REQUIREMENT_TYPE = 'posts.contentType';
     const REQUIREMENT_USER_SCORE = 'posts.userScore';
     const REQUIREMENT_TUMBLEWEED = 'tumbleweed';
+    const REQUIREMENT_FILE_SIZE = 'posts.originalFileSize';
     const REQUIREMENT_IMAGE_WIDTH = 'posts.imageWidth';
     const REQUIREMENT_IMAGE_HEIGHT = 'posts.imageHeight';
     const REQUIREMENT_IMAGE_AREA = 'posts.imageWidth*posts.imageHeight';
diff --git a/src/Search/ParserConfigs/PostSearchParserConfig.php b/src/Search/ParserConfigs/PostSearchParserConfig.php
index f577cca1..cafbc642 100644
--- a/src/Search/ParserConfigs/PostSearchParserConfig.php
+++ b/src/Search/ParserConfigs/PostSearchParserConfig.php
@@ -179,6 +179,11 @@ class PostSearchParserConfig extends AbstractSearchParserConfig
                 return $requirement;
             });
 
+        $this->defineNamedTokenParser(
+            PostFilter::REQUIREMENT_FILE_SIZE,
+            ['file_size'],
+            self::ALLOW_COMPOSITE | self::ALLOW_RANGE);
+
         $this->defineNamedTokenParser(
             PostFilter::REQUIREMENT_IMAGE_WIDTH,
             ['image_width', 'width'],