diff --git a/actions/avatarsettings.php b/actions/avatarsettings.php
index 643c0e5675..79ca6b7898 100644
--- a/actions/avatarsettings.php
+++ b/actions/avatarsettings.php
@@ -75,7 +75,7 @@ class AvatarsettingsAction extends AccountSettingsAction
 
     function getInstructions()
     {
-        return _('You can upload your personal avatar.');
+        return _('You can upload your personal avatar. The maximum file size is '.ImageFile::maxFileSize().'.');
     }
 
     /**
diff --git a/actions/grouplogo.php b/actions/grouplogo.php
index 294005f1bb..4be7c4e12f 100644
--- a/actions/grouplogo.php
+++ b/actions/grouplogo.php
@@ -152,7 +152,7 @@ class GrouplogoAction extends Action
 
     function getInstructions()
     {
-        return _('You can upload a logo image for your group.');
+        return _('You can upload a logo image for your group. The maximum file size is '.ImageFile::maxFileSize().'.');
     }
 
     /**
diff --git a/lib/imagefile.php b/lib/imagefile.php
index 5e9913235c..f9f47a47ee 100644
--- a/lib/imagefile.php
+++ b/lib/imagefile.php
@@ -72,7 +72,7 @@ class ImageFile
             break;
         case UPLOAD_ERR_INI_SIZE:
         case UPLOAD_ERR_FORM_SIZE:
-            throw new Exception(_('That file is too big.'));
+            throw new Exception(_('That file is too big. The maximum file size is '.$this->maxFileSize().'.'));
             return;
         case UPLOAD_ERR_PARTIAL:
             @unlink($_FILES[$param]['tmp_name']);
@@ -182,4 +182,27 @@ class ImageFile
     {
         @unlink($this->filename);
     }
+    
+    static function maxFileSize()
+    {
+        $limit = min(ImageFile::strToInt(ini_get('post_max_size')), ImageFile::strToInt(ini_get('upload_max_filesize')));
+        return ($limit/(1024*1024)).'MB';
+    }
+    
+    static function strToInt($str)
+    {
+        $unit = substr($str, -1);
+        $num = substr($str, 0, -1);
+        
+        switch(strtoupper($unit)){
+            case 'G':
+                $num *= 1024;
+            case 'M':
+                $num *= 1024;
+            case 'K':
+                $num *= 1024;
+        }
+        
+        return $num;
+    }
 }
\ No newline at end of file