diff --git a/docs/docs/how_to/trim_messages.ipynb b/docs/docs/how_to/trim_messages.ipynb
index 505e7b90195..9c6553c7e6d 100644
--- a/docs/docs/how_to/trim_messages.ipynb
+++ b/docs/docs/how_to/trim_messages.ipynb
@@ -30,7 +30,8 @@
     "1. The resulting chat history should be **valid**. Usually this means that the following properties should be satisfied:\n",
     "   - The chat history **starts** with either (1) a `HumanMessage` or (2) a [SystemMessage](/docs/concepts/messages/#systemmessage) followed by a `HumanMessage`.\n",
     "   - The chat history **ends** with either a `HumanMessage` or a `ToolMessage`.\n",
-    "   - A `ToolMessage` can only appear after an `AIMessage` that involved a tool call. \n",
+    "   - A `ToolMessage` can only appear after an `AIMessage` that involved a tool call.\n",
+    "\n",
     "   This can be achieved by setting `start_on=\"human\"` and `ends_on=(\"human\", \"tool\")`.\n",
     "3. It includes recent messages and drops old messages in the chat history.\n",
     "   This can be achieved by setting `strategy=\"last\"`.\n",