diff --git a/src/Approx/Approx_ParametrizationType.hxx b/src/Approx/Approx_ParametrizationType.hxx
index 121f5bfd37..0a19d28649 100644
--- a/src/Approx/Approx_ParametrizationType.hxx
+++ b/src/Approx/Approx_ParametrizationType.hxx
@@ -20,9 +20,9 @@
 
 enum Approx_ParametrizationType
 {
-Approx_ChordLength,
-Approx_Centripetal,
-Approx_IsoParametric
+  Approx_ChordLength, //!< parameters of points are proportionate to distances between them
+  Approx_Centripetal, //!< parameters of points are proportionate to square roots of distances between them
+  Approx_IsoParametric //!< parameters of points are distributed uniformly
 };
 
 #endif // _Approx_ParametrizationType_HeaderFile
diff --git a/src/Approx/Approx_Status.hxx b/src/Approx/Approx_Status.hxx
index a578539264..4827a10e6e 100644
--- a/src/Approx/Approx_Status.hxx
+++ b/src/Approx/Approx_Status.hxx
@@ -17,7 +17,7 @@
 #ifndef _Approx_Status_HeaderFile
 #define _Approx_Status_HeaderFile
 
-
+//! It is an auxiliary flag being used in inner computations
 enum Approx_Status
 {
 Approx_PointsAdded,