Additional notes on legend.ticks.length

Author: Breeze-Hu

R/theme.R

@@ -93,7 +93,9 @@
 #' @param legend.frame frame drawn around the bar ([element_rect()]).
 #' @param legend.ticks tick marks shown along bars or axes ([element_line()])
 #' @param legend.ticks.length length of tick marks in legend
-#'   ([`unit()`][grid::unit]); inherits from `legend.key.size`.
+#'   ([`unit()`][grid::unit]); By default, tick marks are positioned symmetrically.  
+#'   One-sided tick lengths can be controlled using absolute (`unit()`) or relative (`rel()`) values.  
+#'   For example, `unit(c(-0.15, 0), "cm")` or `rel(c(0.175, 0))` produces ticks on one side only.inherits from `legend.key.size`.
 #' @param legend.axis.line lines along axes in legends ([element_line()])
 #' @param legend.text legend item labels ([element_text()]; inherits from
 #'   `text`)