If the template has a separate documentation page (usually called "Template:template name/doc"), add
[[Гурӯҳ:Subtemplates of Template Precision]]
to the <includeonly> section at the bottom of that page. Otherwise, add
<noinclude>[[Гурӯҳ:Subtemplates of Template Precision]]</noinclude>
to the end of the template code, making sure it starts on the same line as the code's last character.
The Category:Subtemplates of Template:Precision contains subtemplates for determining the precision of a number (excluding trailing zeroes), where numbers can have over 48 digits. See similar names: Special:PrefixIndex/Template:Precision.