docs(scale): Add note about major tick label calculation when no custom labels are set (#6585)

1 files changed, 5 insertions, 1 deletions

diff --git a/docs/widgets/scale.rst b/docs/widgets/scale.rst
index 48b5cb9bb..274771cf4 100644
--- a/docs/widgets/scale.rst
+++ b/docs/widgets/scale.rst
@@ -58,10 +58,14 @@ If instead of a numerical value in the major ticks a text is required they can b
 with :cpp:expr:`lv_scale_set_text_src(scale, custom_labels)` using ``NULL`` as the last element, 
 i.e. :cpp:expr:`static char * custom_labels[3] = {"One", "Two", NULL};`.
 
+<strong> NOTE: </strong> The major tick value is calculated with the :cpp:expr:`lv_map` API (when not setting the custom labels),
+this calculation takes into consideration the total tick number and the scale range, so the label drawn can present rounding errors
+when the calculated value is a float number.
+
 The length of the ticks can be configured with the length style property on the :cpp:enumerator:`LV_PART_INDICATOR` 
 for major ticks and :cpp:enumerator:`LV_PART_ITEMS` for minor ticks, for example with local style: 
 :cpp:expr:`lv_obj_set_style_length(scale, 5, LV_PART_INDICATOR);` for major ticks 
-and :cpp:expr:`lv_obj_set_style_length(scale, 5, LV_PART_ITEMS);` for minor ticks.
+and :cpp:expr:`lv_obj_set_style_length(scale, 5, LV_PART_ITEMS);` for minor ticks. 
 
 Sections
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