diff --git a/apps/shadevis/shadevis.txt b/apps/shadevis/shadevis.txt
index f87d2709..e263c30d 100644
--- a/apps/shadevis/shadevis.txt
+++ b/apps/shadevis/shadevis.txt
@@ -31,18 +31,18 @@ In practice tather than considering the ambient lighting to exist uniformally th
 this approach determines the ambient brightness of each part of a surface to be proportional to the extent
 to which the surface has "its outward view of its environment" free i.e. occluded, by other surfaces of the object. For example, the upper part of the David forehead is less exposed to its local environment than the nose and as a consequence it will be proportionally darker.
 
-The most common techniques to compute ambient occlusion is based on shooting rays from each surface element to evaluate the quantity of light that reach it. Shadevis tools use OpenGL to accellerate this process by simply rendering the scene ortographically from a set of uniformely distributed directions and checking against the zbuffer if each vertex is occluded or not.
+The most common techniques to compute ambient occlusion is based on shooting rays from each surface element to evaluate the quantity of light that reach it. Shadevis tools use OpenGL to accellerate this process by simply rendering the scene ortographically from a set of uniformely distributed directions and checking against the zbuffer if each vertex is occluded or not. Usually the result is stored in a texture map.
 
 The Shadevis tool is oriented to handle rather large meshes, we have successfully used on a 8M triangle mesh of the David on a 512Mb machine. 
 
 
-We have used this tool also for computing the exposition of falling agent over the Michelangelo's David.
+We have used this tool also for computing the exposition of falling agents over the Michelangelo's David.
 
 Please, when using this tool cite the following references:
 
 R. Borgo, P. Cignoni, R. Scopigno
 An easy to use visualization system for huge cultural heritage meshes
-VAST’01 Conference, Greece, Nov. 28-30, 2001. s	
+VAST’01 Conference, Greece, Nov. 28-30, 2001. 
 
 
 
@@ -110,7 +110,7 @@ Some useful hints:
 'a'-'A' Increase/Decrease  Ambient Coefficient
 'd'-'D' Increase/Decrease  Diffuse Coefficient
 'e'-'E' Increase/Decrease  Balance between Diffuse and Ambient coefficient
-'1'..'4' Some preset ambient/diffuse values ranging from standard constant ambient to a
+'1'..'4' Some preset values for the ambient/diffuse terms ranging from standard constant ambient to a strongly shaded coloring;
 
  options