diff --git a/_gtfobins/gtester.md b/_gtfobins/gtester.md
index abe70bd..22a1554 100644
--- a/_gtfobins/gtester.md
+++ b/_gtfobins/gtester.md
@@ -1,5 +1,10 @@
 ---
 functions:
+  file-write:
+    - description: Data to be written appears in an XML attribute in the output file: `<testbinary path="DATA">`.
+      code: |
+        LFILE=file_to_write
+        gtester "DATA" -o $LFILE
   shell:
     - code: |
         TF=$(mktemp)