diff --git a/man/waybar-sway-workspaces.5.scd b/man/waybar-sway-workspaces.5.scd
index 620789c4..ec39982d 100644
--- a/man/waybar-sway-workspaces.5.scd
+++ b/man/waybar-sway-workspaces.5.scd
@@ -115,6 +115,12 @@ warp-on-scroll: ++
 	default: false ++
 	Enables this module to consume all left over space dynamically.
 
+*output-classes*: ++
+	typeof: array ++
+	Specify additional CSS classes to be added to workspace indicators based on the output on which the associated workspace is located.
+	Keys are output names and values are class names like *${output}: {output-class}*.
+	Assignment in config is used to keep the stylesheet independent of the available outputs.
+
 
 # FORMAT REPLACEMENTS
 
@@ -210,3 +216,4 @@ n.b.: the list of outputs can be obtained from command line using *swaymsg -t ge
 - *#workspaces button.empty*
 - *#workspaces button.current_output*
 - *#workspaces button#sway-workspace-${name}*
+- *#workspaces button.${output-class}*
diff --git a/src/modules/sway/workspaces.cpp b/src/modules/sway/workspaces.cpp
index 464e22c8..3fc410d2 100644
--- a/src/modules/sway/workspaces.cpp
+++ b/src/modules/sway/workspaces.cpp
@@ -357,6 +357,18 @@ auto Workspaces::update() -> void {
       button.get_style_context()->remove_class("empty");
     }
     if ((*it)["output"].isString()) {
+      // Simply attempt to remove all output classes every time to reset output classes. This works
+      // even if a class has not been previously added to the style context.
+      for (const auto &oclass : config_["output-classes"]) {
+        button.get_style_context()->remove_class(oclass.asString());
+      }
+      // If output-classes contains a class for output associated with current workspace button, add
+      // the class to its style context.
+      std::string output_name = (*it)["output"].asString();
+      if (config_["output-classes"].isMember(output_name) &&
+          config_["output-classes"][output_name].isString()) {
+        button.get_style_context()->add_class(config_["output-classes"][output_name].asString());
+      }
       if (((*it)["output"].asString()) == bar_.output->name) {
         button.get_style_context()->add_class("current_output");
       } else {