diff --git a/doc/COSMOS.md b/doc/COSMOS.md
index 2bad6f9..b4ca2f7 100644
--- a/doc/COSMOS.md
+++ b/doc/COSMOS.md
@@ -18,6 +18,7 @@ Contains the most important programs for the whole document conversion workflow.
  - `tei2eoatex.xsl` : An XSL converter from TEI-XML to EOATeX
  - `tei2imxml.py` : A converter from TEI to customized DocBook XML.
  - `find_chapters.py` : Use LaTeX auxiliary files to split a PDF into chapters
+ - `idassigner.py` : Assign xml:ids to various elements fo TEI file
 
 ## eoa-csl
 A nearly-abandoned version of a CSL configuration for EOA. Currently
diff --git a/idassigner.py b/idassigner.py
index 9a9d9aa..996eed4 100644
--- a/idassigner.py
+++ b/idassigner.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8; mode: python -*-
 
 """
-Docstring goes here
+Assign xml:ids to various elements fo TEI file
 """
 
 __version__ = "1.0"