diff --git a/docs/content/reboot.md b/docs/content/reboot.md
index 9df0a75599..20a76c82cb 100644
--- a/docs/content/reboot.md
+++ b/docs/content/reboot.md
@@ -148,7 +148,7 @@ The `<pre>` element is reset to remove its `margin-top` and use `rem` units for
 
 ## Tables
 
-Tables are slightly adjusted to style `<caption>`s and ensure consistent `text-align` throughout. Additional changes for borders, padding, and more come with [the `.table` class]({{ site.baseurl }}/content/tables/).
+Tables are slightly adjusted to style `<caption>`s, collapse borders, and ensure consistent `text-align` throughout. Additional changes for borders, padding, and more come with [the `.table` class]({{ site.baseurl }}/content/tables/).
 
 <div class="bd-example">
   <table>
diff --git a/scss/_reboot.scss b/scss/_reboot.scss
index deb9613cc6..7c74b978e1 100644
--- a/scss/_reboot.scss
+++ b/scss/_reboot.scss
@@ -268,6 +268,8 @@ textarea {
 //
 
 table {
+  // No longer part of Normalize since v4
+  border-collapse: collapse;
   // Reset for nesting within parents with `background-color`.
   background-color: $table-bg;
 }