diff --git a/README.md b/README.md
index d165871..dcc4f9c 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ If you are experiencing issues then you may want to check out the [Known Issues]
 
 ### Changelog:
 
-2021-11-23 - Added the taglabels patch
+2021-11-23 - Added the taglabels and underlinetags patches
 
 2021-09-08 - Added the alwayscenter patch
 
@@ -469,6 +469,9 @@ If you are experiencing issues then you may want to check out the [Known Issues]
       - this patch adds key modes (like in vim or emacs) where chains of keyboard shortcuts can be
         performed
 
+   - [killunsel](https://dwm.suckless.org/patches/killunsel/)
+      - kills all visible clients that are not selected (only the selected client will remain)
+
    - [~leftlayout~](http://dwm.suckless.org/patches/leftlayout/)
       - ~moves the layout symbol in the status bar to the left hand side~
 
@@ -746,13 +749,13 @@ If you are experiencing issues then you may want to check out the [Known Issues]
       - lets you transfer all clients between the master and stack area while increasing or
         decreasing the master area (nmaster) accordingly
 
+   - [underlinetags](https://dwm.suckless.org/patches/underlinetags/)
+      - underlines the selected tag, or optionally all tags
+
    - [unfloatvisible](https://dwm.suckless.org/patches/unfloatvisible/)
       - resets isfloating on any visible windows that have it set and optionally also applies a
         layout
 
-   - [killunsel](https://dwm.suckless.org/patches/killunsel/)
-      - kills all visible clients that are not selected (only the selected client will remain)
-
    - [~urgentborder~](https://dwm.suckless.org/patches/urgentborder/)
       - ~this patch makes "urgent" windows have different colors~
 
diff --git a/config.def.h b/config.def.h
index 2ed1a25..61dd14a 100644
--- a/config.def.h
+++ b/config.def.h
@@ -96,6 +96,12 @@ static const char ptagf[] = "[%s %s]";          /* format of a tag label */
 static const char etagf[] = "[%s]";             /* format of an empty tag */
 static const int lcaselbl = 0;                  /* 1 means make tag label lowercase */
 #endif // BAR_TAGLABELS_PATCH
+#if BAR_UNDERLINETAGS_PATCH
+static const unsigned int ulinepad = 5;         /* horizontal padding between the underline and tag */
+static const unsigned int ulinestroke  = 2;     /* thickness / height of the underline */
+static const unsigned int ulinevoffset = 0;     /* how far above the bottom of the bar the line should appear */
+static const int ulineall = 0;                  /* 1 to show underline on all tags, 0 for just the active ones */
+#endif // BAR_UNDERLINETAGS_PATCH
 
 /* Indicators: see patch/bar_indicators.h for options */
 static int tagindicatortype              = INDICATOR_TOP_LEFT_SQUARE;
diff --git a/patch/bar_taglabels.c b/patch/bar_taglabels.c
index f9c3cf8..9e6d441 100644
--- a/patch/bar_taglabels.c
+++ b/patch/bar_taglabels.c
@@ -63,6 +63,10 @@ draw_taglabels(Bar *bar, BarArg *a)
 		w = TEXTW(m->taglabel[i]);
 		drw_text(drw, x, a->y, w, a->h, lrpad / 2, m->taglabel[i], invert, False);
 		drawindicator(m, NULL, occ, x, a->y, w, a->h, i, -1, invert, tagindicatortype);
+		#if BAR_UNDERLINETAGS_PATCH
+		if (ulineall || m->tagset[m->seltags] & 1 << i)
+			drw_rect(drw, x + ulinepad, bh - ulinestroke - ulinevoffset, w - (ulinepad * 2), ulinestroke, 1, 0);
+		#endif // BAR_UNDERLINETAGS_PATCH
 		x += w;
 	}
 
diff --git a/patch/bar_tags.c b/patch/bar_tags.c
index c00818d..c618ff5 100644
--- a/patch/bar_tags.c
+++ b/patch/bar_tags.c
@@ -57,6 +57,10 @@ draw_tags(Bar *bar, BarArg *a)
 		]);
 		drw_text(drw, x, a->y, w, a->h, lrpad / 2, icon, invert, False);
 		drawindicator(m, NULL, occ, x, a->y, w, a->h, i, -1, invert, tagindicatortype);
+		#if BAR_UNDERLINETAGS_PATCH
+		if (ulineall || m->tagset[m->seltags] & 1 << i)
+			drw_rect(drw, x + ulinepad, bh - ulinestroke - ulinevoffset, w - (ulinepad * 2), ulinestroke, 1, 0);
+		#endif // BAR_UNDERLINETAGS_PATCH
 		x += w;
 	}
 
diff --git a/patches.def.h b/patches.def.h
index 7451dc4..022a4a6 100644
--- a/patches.def.h
+++ b/patches.def.h
@@ -160,6 +160,11 @@
  */
 #define BAR_TAGLABELS_PATCH 0
 
+/* This patch underlines the selected tag, or optionally all tags.
+ * https://dwm.suckless.org/patches/underlinetags/
+ */
+#define BAR_UNDERLINETAGS_PATCH 0
+
 /* This patch adds the window icon next to the window title in the bar.
  *
  * The patch depends on Imlib2 for icon scaling.