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-rw-r--r--Doc/Zsh/params.yo8
1 files changed, 7 insertions, 1 deletions
diff --git a/Doc/Zsh/params.yo b/Doc/Zsh/params.yo
index b896e2d70..eb31286e4 100644
--- a/Doc/Zsh/params.yo
+++ b/Doc/Zsh/params.yo
@@ -771,7 +771,13 @@ Incremented by one each time a new shell is started.
 )
 vindex(signals)
 item(tt(signals))(
-An array containing the names of the signals.
+An array containing the names of the signals.  Note that with
+the standard zsh numbering of array indices, where the first element
+has index 1, the signals are offset by 1 from the signal number
+used by the operating system.  For example, on typical Unix-like systems
+tt(HUP) is signal number 1, but is referred to as tt($signals[2]).  This
+is because of tt(EXIT) at position 1 in the array, which is used
+internally by zsh but is not known to the operating system.
 )
 vindex(TRY_BLOCK_ERROR)
 item(tt(TRY_BLOCK_ERROR) <S>)(