diff --git a/doc/salome/gui/GEOM/input/geometry_preferences.doc b/doc/salome/gui/GEOM/input/geometry_preferences.doc
index 454ac3210..4e37ef4c6 100644
--- a/doc/salome/gui/GEOM/input/geometry_preferences.doc
+++ b/doc/salome/gui/GEOM/input/geometry_preferences.doc
@@ -94,7 +94,14 @@ By default <b>Along U</b> and <b>Along V</b> are null and isolines are not drawn
 
 <ul>
 <li><b>Input fields precision</b> - a group of preferences controlling input
-precision for floating-point data.</li>
+  precision for floating-point data. The semantics of the precision
+  values is described in detail in <em>Using input widgets</em>
+  chapter of GUI documentation (Introduction to Salome Platform /
+  Introduction to GUI / Using input widgets). In brief: \b positive
+  precision value is the maximum allowed number of digits after the
+  decimal point in the fixed-point format; \b nagative precision value
+  is the maximum allowed number of significant digits in mantissa in
+  either the fixed-point or scientific format.</li>
 <ul>
 <li><b>Length precision</b> - allows to adjust input precision of coordinates and dimensions.</li>
 <li><b>Angular precision</b> - allows to adjust input precision of angles.</li>