From 873abd83cf281e33ce3d99fb4037c46aa06f5d27 Mon Sep 17 00:00:00 2001
From: Joy <74623359+joyvelasquez@users.noreply.github.com>
Date: Mon, 26 Aug 2024 16:12:58 -0400
Subject: [PATCH] Adding Light Leak definition (#274)

---
 docs/glossary.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/docs/glossary.rst b/docs/glossary.rst
index 19315644f..715638b44 100644
--- a/docs/glossary.rst
+++ b/docs/glossary.rst
@@ -9,6 +9,13 @@ Glossary
 .. glossary::
    :sorted:
 
+   Light Leak
+      In the context of the X-Ray Telescope (XRT), a light leak refers to periodic increases in visible stray light contamination, which is often categorized as stray light.
+      This phenomenon is primarily attributed to a potential pinhole in the telescope's entrance filter, allowing some visible light transmission even when the visible light shutter is closed.
+      This defect has resulted in significant visible light contributions to X-ray images, especially noticeable in some of the thinner XRT X-ray filters.
+      Users of XRT data, particularly those working with affected filters, are encouraged to consult the `SolarSoft XRT Analysis Guide`_ for detailed analysis and
+      potential corrections of the stray light in their datasets (see Table 2.2 in the guide for more details).
+
    DN
       Data number (DN) per unit.