diff --git a/gh-toc.js b/gh-toc.js
index f871fb2..16edeb4 100644
--- a/gh-toc.js
+++ b/gh-toc.js
@@ -39,6 +39,9 @@ function tocIt(inputMD, minHeading, maxHeading, ignoreLinex)
             headingAnchor = headingAnchor.replace(/[^\p{L}\p{Nd}\p{Nl}\s_-]/gu, "");
             // remove sequences of *
             headingAnchor = headingAnchor.replace(/\*(?=.*)/gu, "");
+            // TODO: Find a good way to keep underscores, except those for Markdown italics
+            // Right now, we’re just keeping underscores
+
             // replace remaining blanks with '-'
             headingAnchor = headingAnchor.replace(/ /gu, "-");
           
diff --git a/testing.md b/testing.md
index 1093b97..46d8b29 100644
--- a/testing.md
+++ b/testing.md
@@ -9,7 +9,18 @@ Let’s check if these coincide with whatever GitHub Markdown comes up with!
 
 ## Specials
 ### Some `code_with_underscores += a*b`
-### Just __ some underlines, or __dunders__
+### More `code_bars`
+
+### Underscore stuff
+#### Just __ some underlines, or __dunders__
+#### ___
+#### __
+#### __dunder__
+#### _emphasis_
+#### _ emph _
+#### _in a *sentence*_
+#### _in_word_parsing_
+
 ### Some _emphasized_ text
 ### Some **bold** text
 ### Some ~~strikethrough~ text