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-rw-r--r--Documentation/admin-guide/sysrq.rst11
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/admin-guide/sysrq.rst b/Documentation/admin-guide/sysrq.rst
index 51906e4732..2f2e5bd440 100644
--- a/Documentation/admin-guide/sysrq.rst
+++ b/Documentation/admin-guide/sysrq.rst
@@ -75,10 +75,19 @@ On other
submit a patch to be included in this section.
On all
- Write a character to /proc/sysrq-trigger. e.g.::
+ Write a single character to /proc/sysrq-trigger.
+ Only the first character is processed, the rest of the string is
+ ignored. However, it is not recommended to write any extra characters
+ as the behavior is undefined and might change in the future versions.
+ E.g.::
echo t > /proc/sysrq-trigger
+ Alternatively, write multiple characters prepended by underscore.
+ This way, all characters will be processed. E.g.::
+
+ echo _reisub > /proc/sysrq-trigger
+
The :kbd:`<command key>` is case sensitive.
What are the 'command' keys?