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-rw-r--r--pod/perlsyn.pod3
1 files changed, 3 insertions, 0 deletions
diff --git a/pod/perlsyn.pod b/pod/perlsyn.pod
index aabd65d212..3d45d55f52 100644
--- a/pod/perlsyn.pod
+++ b/pod/perlsyn.pod
@@ -105,6 +105,9 @@ as the last item in a statement.
The number 0, the strings C<'0'> and C<''>, the empty list C<()>, and
C<undef> are all false in a boolean context. All other values are true.
+Negation of a true value by C<!> or C<not> returns a special false value.
+When evaluated as a string it is treated as C<''>, but as a number, it
+is treated as 0.
=head2 Statement Modifiers