diff --git a/src/FontLib/EOT/File.php b/src/FontLib/EOT/File.php
index 55933eb..c9b4518 100644
--- a/src/FontLib/EOT/File.php
+++ b/src/FontLib/EOT/File.php
@@ -85,6 +85,15 @@ public function readUInt32() {
     return $uint32 >> 16 & 0x0000FFFF | $uint32 << 16 & 0xFFFF0000;
   }
 
+
+  function setData($name, $key, $value) {
+    if (!$key) {
+      $this->header->data = $value;
+    } else {
+      $this->header->data[$key] = $value;
+    }
+  }
+
   /**
    * Get font copyright
    *
diff --git a/src/FontLib/TrueType/File.php b/src/FontLib/TrueType/File.php
index 14e0181..4bf80e1 100644
--- a/src/FontLib/TrueType/File.php
+++ b/src/FontLib/TrueType/File.php
@@ -470,6 +470,14 @@ public function getData($name, $key = null) {
     }
   }
 
+  public function setData($name, $key, $value) {
+    if (!$key) {
+      $this->data[$name]->data = $value;
+    } else {
+      $this->data[$name]->data[$key] = $value;
+    }
+  }
+
   function addDirectoryEntry(DirectoryEntry $entry) {
     $this->directory[$entry->tag] = $entry;
   }