diff --git a/3_first_steps_in_a_terminal.md b/3_first_steps_in_a_terminal.md
index 7ede70fca21c33d35b02c05126b77fe3c6481b00..9c0e61108ed79a7e0d15f9b5d93d4a6fed0f74d5 100644
--- a/3_first_steps_in_a_terminal.md
+++ b/3_first_steps_in_a_terminal.md
@@ -78,12 +78,12 @@ What is the effect of the `-3` parameter ?
 
 You can add as many parameters as you want to your command, try `-3 -1` what is the meaning of the `-1` parameter ?
 
-The `-H` option display the month of a given date in a `yyyy-mm-dd` format. Try to display your month of birth in vertical format.
+The `-d` option display the month of a given date in a `yyyy-mm` format. Try to display your month of birth.
 
 Traditionally, parameters are *named* which means that they are in the form of:
 
 * `-X` for an on/off option (like `cal -3`)
-* `-X something` for an input option (like `cal -H yyyy-mm-dd`)
+* `-X something` for an input option (like `cal -d yyyy-mm`)
 
 Here the name of the parameter is `X`, but software can also accept list of unnamed parameters. Try the following:
 
@@ -139,7 +139,7 @@ What changed compared to the `ls` command without this option ?
 
 Go to your home folder with the bare `cd` command and run the `ls -a` command again. The `-a` option makes the `ls` command list hidden files and folders. On Unix systems, hidden files and folders are all files and folders whose name starts with a "**.**".
 
-Can you `cd` to "**.*" ? 
+Can you `cd` to "**.**" ? 
 
 ```sh
 cd .