Document availability of self-update command

The self-update command is only available when running as a PHAR (see commit 761ad6d171); notably, it is not defined in the Ubuntu package.
2020-10-26 13:03:24 +01:00 · 2020-10-26 13:03:24 +01:00 · adf27d61e9
parent 3772696ad6
commit adf27d61e9
1 changed files with 3 additions and 0 deletions
--- a/doc/03-cli.md
+++ b/doc/03-cli.md
@ -607,6 +607,9 @@ you may have to run the command with `root` privileges
 sudo -H composer self-update
 ```

+If Composer was not installed as a PHAR, this command is not available.
+(This is sometimes the case when Composer was installed by an operating system package manager.)
+
 ### Options

 * **--rollback (-r):** Rollback to the last version you had installed.