From e83458c0d57fcd0b88d2911cf08d620893ab3d1a Mon Sep 17 00:00:00 2001
From: Simon Torres <storres@ctio.noao.edu>
Date: Tue, 6 Apr 2021 18:23:52 -0400
Subject: [PATCH] Added header changes update

---
 docs/header_history.rst       | 48 +++++++++++++++++++++++++++++++++++
 docs/index.rst                |  1 +
 goodman_pipeline/core/core.py |  2 +-
 3 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 docs/header_history.rst

diff --git a/docs/header_history.rst b/docs/header_history.rst
new file mode 100644
index 00000000..5de9f55f
--- /dev/null
+++ b/docs/header_history.rst
@@ -0,0 +1,48 @@
+.. _hhistory:
+
+Header History
+##############
+
+FITS file headers had suffered of changes aimed to improve them. This makes it
+hard to be able to process older data given that, obiously, new keywords did not exist before.
+In this section we aim to track all the changes.
+
+Keyword Addition or Subtraction
+*******************************
+
+Additions
+=========
+
+2019-10-21
+  HEADERVE
+  IMAGEID
+  L1PUBDAT
+  BLKUID
+  RLEVEL
+  TELID
+  SITEID
+  PROPID
+  REQNUM
+  CONFID
+  OBSID
+
+2019-09-01
+  LAMP_DPE
+  LAMP_QPE
+
+2018-04-12
+  LAMP_DOM
+  LAMP_BUL
+  LAMP_QUA
+  LAMP_CU
+  LAMP_FE
+  LAMP_AR
+  LAMP_NE
+  LAMP_HGA
+
+Deletions
+=========
+
+
+Value Changes
+*************
\ No newline at end of file
diff --git a/docs/index.rst b/docs/index.rst
index 9a217382..fdd9b444 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -38,6 +38,7 @@ computers.
   usage
   Remote Access <remote_access>
   install
+  Header Changes <header_history>
 
 
 .. toctree::
diff --git a/goodman_pipeline/core/core.py b/goodman_pipeline/core/core.py
index f9cd888e..26343e23 100644
--- a/goodman_pipeline/core/core.py
+++ b/goodman_pipeline/core/core.py
@@ -1163,7 +1163,7 @@ def extract_fractional_pixel(ccd, target_trace, target_fwhm, extraction_width,
           `target_fwhm`. For instance if `extraction_with` is set to 1 the
           function extract 0.5 to each side from the center of the traced
           target.
-        background_spacing (float): Number of `target_stddev` to separate the
+        background_spacing (float): Number of `target_fwhm` to separate the
           target extraction to the background. This is from the edge of the
           extraction zone to the edge of the background region.
     """