diff --git a/docs/books/admin_guide/03-commands.md b/docs/books/admin_guide/03-commands.md
index 60aba8b3db..2959183c11 100644
--- a/docs/books/admin_guide/03-commands.md
+++ b/docs/books/admin_guide/03-commands.md
@@ -479,20 +479,20 @@ The main options of the `ls` command are:
 | ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------ |
 | `-a`                                                         | Displays all files, even hidden ones. Hidden files in Linux are those beginning with `.`.                                            |
 | `-i`                                                         | Displays inode numbers.                                                                                                              |
-| `-l`                                                         | Displays a vertical list of files with additional information formatted in columns.                                 |
+| `-l`                                                         | Use a long listing format, that is, each line displays long format information for a file or directory.                                 |
 
 The `ls` command, however, has a lot of options (see `man`):
 
 | Option                                                       | Information                                                                                                                          |
 | ------                                                       | ------------                                                                                                                         |
 | `-d`                                                         | Displays information about a directory instead of listing its contents.                                                              |
-| `-g`                                                         | Displays UID and GID rather than owner names.                                                                                        |
-| `-h`                                                         | Displays file sizes in the most appropriate format (byte, kilobyte, megabyte, gigabyte, ...). `h` stands for Human Readable.         |
-| `-s`                                                         | Displays the number of blocks occupied by the file. One block equals 400K.                                                                                      |
+| `-g`                                                         | Like -l option, but do not list owner.                                                                                               |
+| `-h`                                                         | Displays file sizes in the most appropriate format (byte, kilobyte, megabyte, gigabyte, ...). `h` stands for Human Readable. Needs to be used with -l option.         |
+| `-s`                                                         | Displays the allocated size of each file, in blocks. In the GNU/Linux operating system, "block" is the smallest unit of storage in the file system, one block equals 4096Byte. |
 | `-A`                                                         | Displays all files in the directory except `.` and `..`                                                                              |
 | `-R`                                                         | Displays the contents of subdirectories recursively.                                                                                 |
 | `-F`                                                         | Displays the type of files. Prints a `/` for a directory, `*` for executables, `@` for a symbolic link, and nothing for a text file. |
-| `-X`                                                         | Sorts files according to their extensions.                                                                                            |
+| `-X`                                                         | Sorts files according to their extensions.                                                                                           |
 
 * Description of columns generated by running the `ls -lia` command: