diff --git a/input_output.ipynb b/input_output.ipynb
index 95743d07..6fc1f5ce 100644
--- a/input_output.ipynb
+++ b/input_output.ipynb
@@ -129,7 +129,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "1. Complete the function `solution_print_odd` to **print** all the *odd* numbers between 0 and `n`. The value of `n` is provided as the single parameter of the function."
+    "1. Complete the function `solution_print_odd` to **print** all the *odd* numbers between 0 and `n`, **without `n`**. The value of `n` is provided as the parameter of the function `solution_print_odd`."
    ]
   },
   {
@@ -155,7 +155,7 @@
     "\n",
     "<div class=\"alert alert-block alert-warning\">\n",
     "    <h4><b>Note</b></h4>\n",
-    "    There is no test for this exercise because of the way capturing the user input works\n",
+    "    There is no test for this exercise because we cannot easily interact with <code>input</code> in our testing framework. You can check visually if the input does what is expected.\n",
     "</div>"
    ]
   },
@@ -597,7 +597,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "1. Modify the function `solution_write_file` to write the sentence \"python tutorial 2023\" to the file `output_file` passed as argument to the function"
+    "1. Modify the function `solution_write_file` to write the sentence \"python tutorial 2023\" (**without quotes**) to the file `output_file`, which is available as a `Path` object as argument to the function."
    ]
   },
   {
@@ -621,7 +621,17 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "2. Modify the function `solution_read_write_file` to read the lines from the file `input_file` and write them in the form `line, length`, to the file `output_file`. Here `line` is the corresponding line of text in `input_file`, `length` is **number of characters** in that line"
+    "1. Modify the function `solution_read_write_file` to read the lines from the file `input_file` and write them in the form `line, length`, to the file `output_file`. Here `line` is the line of text in `input_file` **without the line ending**, `length` is **number of characters** in that line.\n",
+    "If `input_file` contains these lines:\n",
+    "    ```\n",
+    "    first\n",
+    "    second\n",
+    "    ```\n",
+    "    we expect the output file to contain these lines:\n",
+    "    ```\n",
+    "    first, 5\n",
+    "    second, 6\n",
+    "    ```"
    ]
   },
   {