diff --git a/src/ifcopenshell-python/docs/ifcopenshell-python/selector_syntax.rst b/src/ifcopenshell-python/docs/ifcopenshell-python/selector_syntax.rst
index f01963a2da..c9900a5aad 100644
--- a/src/ifcopenshell-python/docs/ifcopenshell-python/selector_syntax.rst
+++ b/src/ifcopenshell-python/docs/ifcopenshell-python/selector_syntax.rst
@@ -233,4 +233,4 @@ nest formulas, for example ``concat(title("foo"), lower("Bar"))`` will produce
     "``concat({{value}}[, {{value2}}]*)``", "``concat(""foo"", ""bar"")``", "``foobar``", "Concatenates two or more strings."
     "``round({{value}}, {{precision}})``", "``round(3.123, 0.1)``", "``3.1``", "Rounds ``{{value}}`` to the nearest ``{{precision}}``."
     "``metric_length({{value}}, {{precision}}, {{decimals}})``", "``metric_length(3.123, 0.1, 2)``", "``3.10``", "Rounds ``{{value}}`` to the nearest ``{{precision}}`` then displays using a certain amount of decimal places."
-    "``imperial_length({{value}}, {{precision}}, {{unit}})``", "``imperial_length(3.22, 4, ""foot"")``", "``3' - 3 3/4""``", "Rounds ``{{value}}`` to the nearest ``1/{{precision}}`` inch then displays using fractional feet and inches. The ``{{value}}`` may be specified either as ``foot`` or ``inch`` depending on ``{{unit}}``."
+    "``imperial_length({{value}}, {{precision}}, {{input_unit}}, {{output_unit}})``", "``imperial_length(3.22, 4, ""foot"")``", "``3' - 3 3/4""``", "``The {{value}}`` may be specified either as ``foot`` or ``inch`` depending on ``{{input_unit}}``. The ``{{value}}`` is then rounded to the nearest ``1/{{precision}}`` inch then formatted using fractional feet and inches if ``{{output_unit}}`` is set to ``foot`` or just inches if ``{{output_unit}}`` is set to ``inch``."