diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5762280bb..9b3357bd3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - [#215](https://github.com/ClementTsang/bottom/pull/215): Add labels to Linux temperature values.
 
+- [#224](https://github.com/ClementTsang/bottom/pull/224): Implements sorting by count. It previously did absolutely nothing.
+
 ## [0.4.7] - 2020-08-26
 
 ### Bug Fixes
diff --git a/src/lib.rs b/src/lib.rs
index 58b68cb7d..7857e31c1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -663,7 +663,15 @@ fn sort_process_data(
             )
         }),
         ProcessSorting::Count => {
-            // Nothing should happen here.
+            if proc_widget_state.is_grouped {
+                to_sort_vec.sort_by(|a, b| {
+                    utils::gen_util::get_ordering(
+                        a.group_pids.len(),
+                        b.group_pids.len(),
+                        proc_widget_state.process_sorting_reverse,
+                    )
+                });
+            }
         }
     }
 }