diff --git a/pdftools/formfill.py b/pdftools/formfill.py
index 7f8a477..49ebf5e 100644
--- a/pdftools/formfill.py
+++ b/pdftools/formfill.py
@@ -9,17 +9,7 @@ from reportlab.lib.units import mm
 from reportlab.lib.pagesizes import A4
 
 
-def parse_text_file(text_file, ignore_first_line=True):
-    with open(text_file) as fh:
-        if ignore_first_line:
-            next(fh)
-        lines = [line.strip() for line in fh]
-
-    parts = [line.split("\t") for line in lines if line]
-    return [tuple(map(str.strip, p)) for p in parts]
-
-
-def fill(original_form, draw_function, values, output_file="filled.pdf"):
+def fill(original_form, values, draw_function, output_file="filled.pdf"):
     p = Path(output_file)
     if p.exists():
         p.unlink()
@@ -60,42 +50,3 @@ def fill(original_form, draw_function, values, output_file="filled.pdf"):
             subprocess.run(["open", output_file])
 
 
-
-
-
-
-if __name__=="__main__":
-
-    attend = parse_text_file("teilnehmertabelle.txt")
-
-    def create_overlay(c, item):
-        company, addr, name = item
-        c.setFont("Helvetica", 11)
-        c.drawString( 75*mm, 234*mm, "Universität Freiburg, IMTEK, CPI")
-        c.drawString(118*mm, 225*mm, "20126 N")
-        c.drawString( 58*mm, 216*mm, "VDK-Bestimmung in Jungbier")
-
-        if company.startswith("Wissenschaftsförderung"):
-            c.setFont("Helvetica", 10)
-        c.drawString( 35*mm, 204*mm, f"{company}, {addr}")
-        if company.startswith("Wissenschaftsförderung"):
-            c.setFont("Helvetica", 11)
-        c.drawString( 35*mm, 191*mm, f"19.02.2019")
-        c.drawString(113*mm, 191*mm, f"10:30 Uhr")
-        c.drawString(150*mm, 191*mm, f"16:00 Uhr")
-
-        c.drawString( 25.8*mm, 177.75*mm, f"X")
-
-        c.drawString( 35*mm, 169*mm, name)
-        c.drawString( 35*mm, 156*mm, "Teilname Kickoff-Meeting")
-
-        c.drawString( 37.15*mm, 134.35*mm, f"X")
-        c.drawString( 54*mm, 134*mm, "1")
-
-        c.drawString( 24*mm, 82*mm, "Freiburg, den 19.02.2019")
-
-        c.setFont("Helvetica-Bold", 12)
-        c.drawString( 117*mm, 100*mm, "1.000")
-
-    #fill("form.pdf", create_overlay, attend)
-    ruler_overlay("form.pdf")
diff --git a/pdftools/ruler.py b/pdftools/ruler.py
index e88b6d4..3b9020d 100644
--- a/pdftools/ruler.py
+++ b/pdftools/ruler.py
@@ -23,4 +23,4 @@ def ruler_overlay(original_form):
     ofp = Path(original_form)
     out_path = ofp.parent / f"{ofp.stem}_ruler.pdf"
 
-    formfill.fill(original_form, ruler, [1], output_file=out_path)
+    formfill.fill(original_form, [1], ruler, output_file=out_path)
diff --git a/readme.md b/readme.md
index 93ab292..7f63d25 100644
--- a/readme.md
+++ b/readme.md
@@ -6,10 +6,11 @@ This package provides some cli commands:
  - `nameplates` generate a pdf with nameplates
  - `addruler` adds a blue ruler to a pdf
 
+And a module to assist with filling out pdf forms: `pdftools.formfill`
 
 
-nameplates
-----------
+nameplates (cli)
+----------------
 
     Usage: nameplates [OPTIONS] ATTENDEES [LOGO]
 
@@ -32,8 +33,8 @@ nameplates
 
 
 
-addruler
---------
+addruler (cli)
+--------------
 
     Usage: addruler [OPTIONS] PDF
 
@@ -41,3 +42,39 @@ addruler
 
     Options:
       --help  Show this message and exit.
+
+
+
+formfill (module)
+-----------------
+
+
+The formfill module helps filling out pdf forms with other data. But there is
+no command line interface, you have to create a function on where to position
+what on the form.
+
+The function requires some Reportlab knowledge. An example:
+
+    from pdftools.formfill import fill
+    from reportlab.lib.units import mm
+
+    # `parse_file` is an exercise  to the reader
+    attendees = parse_file("teilnehmertabelle.txt")
+
+
+    # function defining where to draw what.
+    def custom_function(canvas, item):
+
+        # one item consists of three things
+        company, address, name = item
+
+        canvas.setFont("Helvetica", 11)
+        canvas.drawString( 35*mm, 204*mm, f"{company}, {address}")
+        canvas.setFont("Helvetica-Bold", 11)
+        canvas.drawString( 35*mm, 169*mm, name)
+        canvas.drawString( 35*mm,  82*mm, "19.02.2019")
+
+    # "form.pdf" should be the path to the form file
+    fill("form.pdf", attendees, custom_function)
+
+