diff --git a/python/docs/src/user-guide/core-user-guide/framework/agent-and-agent-runtime.ipynb b/python/docs/src/user-guide/core-user-guide/framework/agent-and-agent-runtime.ipynb
index 7f18ac2bce3e..299c92b9208e 100644
--- a/python/docs/src/user-guide/core-user-guide/framework/agent-and-agent-runtime.ipynb
+++ b/python/docs/src/user-guide/core-user-guide/framework/agent-and-agent-runtime.ipynb
@@ -8,7 +8,7 @@
                 "\n",
                 "In this and the following section, we focus on the core concepts of AutoGen:\n",
                 "agents, agent runtime, messages, and communication -- \n",
-                "the foundational building blocks for an multi-agent applications.\n",
+                "the foundational building blocks for a multi-agent applications.\n",
                 "\n",
                 "```{note}\n",
                 "The Core API is designed to be unopinionated and flexible. So at times, you\n",