diff --git a/checks/async/async10.py b/checks/async/async10.py
index 5a43777..777f709 100644
--- a/checks/async/async10.py
+++ b/checks/async/async10.py
@@ -1,4 +1,7 @@
+# checks/async/async10.py
 import asyncio
 
-assert asyncio.run(fetch_all(["ada", "lin", "guido"])) == "ADA,LIN,GUIDO"
+assert asyncio.run(fetch_all(["ada", "lin", "guido"])) == "ADA,LIN,GUIDO", (
+    "fetch_all() should return the names uppercased and comma-separated"
+)
 print("async10 ok")
diff --git a/checks/async/async7.py b/checks/async/async7.py
index 7bbfedb..162fd10 100644
--- a/checks/async/async7.py
+++ b/checks/async/async7.py
@@ -1,4 +1,7 @@
+# checks/async/async7.py
 import asyncio
 
-assert asyncio.run(with_timeout()) == "done"
+assert asyncio.run(with_timeout()) == "done", (
+    "with_timeout() should return 'done' within the timeout"
+)
 print("async7 ok")
diff --git a/checks/async/async8.py b/checks/async/async8.py
index ba96933..93f6d14 100644
--- a/checks/async/async8.py
+++ b/checks/async/async8.py
@@ -1,2 +1,3 @@
-assert result == 42
+# checks/async/async8.py
+assert result == 42, "result should be 42 after running the async function"
 print("async8 ok")
diff --git a/checks/async/async9.py b/checks/async/async9.py
index b331cd7..544a2f2 100644
--- a/checks/async/async9.py
+++ b/checks/async/async9.py
@@ -1,4 +1,7 @@
+# checks/async/async9.py
 import asyncio
 
-assert asyncio.run(double_all([1, 2, 3])) == [2, 4, 6]
+assert asyncio.run(double_all([1, 2, 3])) == [2, 4, 6], (
+    "double_all() should return [2, 4, 6] for [1, 2, 3]"
+)
 print("async9 ok")