diff --git a/src/GitHubActions.jl b/src/GitHubActions.jl
index c1fe9e8..d9ff913 100644
--- a/src/GitHubActions.jl
+++ b/src/GitHubActions.jl
@@ -3,6 +3,7 @@ module GitHubActions
 export
     GitHubActionsLogger,
     add_path,
+    add_summary,
     end_group,
     get_input,
     get_state,
@@ -212,6 +213,15 @@ function set_failed(msg)
     log_error(msg)
 end
 
+"""
+    add_summary(v)
+
+Add `v` to the job summary.
+"""
+function add_summary(v)
+    add_to_file("GITHUB_STEP_SUMMARY", v)
+end
+
 """
     GitHubActionsLogger(level)
 
diff --git a/test/runtests.jl b/test/runtests.jl
index d81a1c0..e5f3e41 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -67,6 +67,15 @@ const GHA = GitHubActions
         end
     end
 
+    mktemp() do file, io
+        withenv("GITHUB_STEP_SUMMARY" => file) do
+            add_summary("testsummary")
+            @test read(file, String) == "testsummary\n"
+            add_summary("anothersummary")
+            @test read(file, String) == "testsummary\nanothersummary\n"
+        end
+    end
+
     withenv(() -> (@test get_input("A") == ""), "INPUT_A" => "")
     withenv(() -> (@test get_input("A") == ""), "INPUT_A" => nothing)
     withenv(() -> (@test get_input("A") == "b"), "INPUT_A" => "b")