diff --git a/mandelbulber2/manual/chapters/materials.tex b/mandelbulber2/manual/chapters/materials.tex
index 1eba040..4a2d0f9 100644
--- a/mandelbulber2/manual/chapters/materials.tex
+++ b/mandelbulber2/manual/chapters/materials.tex
@@ -251,13 +251,13 @@ \subsection{Surface color}\label{materials-surface_color}
 {Different surface colors}
 {material-surface-color-example}{H}
 
-The option \emph{Use color texture from an image} allows to cover objects with texture which will define colors of surface. More details about texture mapping are in chapter \ref{materials-textures}
+The option \emph{Use color texture from an image} allows the surface of objects to be covered with a colored texture from an image. More details about texture mapping are in chapter \ref{materials-textures}
 
 \simpleImageWithCaptionThirdWidth{img/manual/media/material_texture_color.png}
 {Objects with color texture}
 {material-color-texture}{H}
 
-Surface color (from color box) can be mixed with colors from bitmap texture. Strength of bitmap influence can be adjusted with \emph{texture intensity} parameter.
+Surface color (from color box) can be mixed with the color texture from an image file. The strength of the image influence can be adjusted with \emph{texture intensity} parameter.
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/material_texture_color_mixed.png}
@@ -363,7 +363,7 @@ \subsection{Rough surface}\label{materials-roughness}
 {roughness = 0.1}
 {material-surface-roughness-01}
 
-Local roughness of surface can be controlled using bitmap texture. For this have to be used option \emph{Use roughness map texture}. Brighter areas of texture will appear as higher roughness of surface. Black color means no roughness. More details about texture mapping are in chapter \ref{materials-textures}.
+Local roughness on the surface can be controlled by using a texture from an image file, when option \emph{Use roughness map texture} is enabled. Brighter areas of the texture will appear as higher roughness on the surface, whereas a black color appears as no roughness. More details about texture mapping are in chapter \ref{materials-textures}.
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/material_texture_roughness.png}
@@ -427,14 +427,14 @@ \subsection{Luminosity}\label{materials-luminosity}
 {High luminosity values (about 5) and MC global illumination enabled}
 {material-luminosity}{H}
 
-For luminosity effect can be used bitmap texture. Intensity of illumination by texture can be adjusted by \emph{texture intensity} parameter. More details about texture mapping are in chapter \ref{materials-textures}.
+The luminosity effect can use a texture from an image file. The \emph{texture intensity} parameter adjusts the illumination intensity. More details about texture mapping are in chapter \ref{materials-textures}.
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/material_texture_luminosity.png}
 {Example use of luminosity texture - texture intensity = 20}
 {material-luminosity-texture-usage}
 {img/manual/media/material_luminosity_texture.jpg}
-{Luminosity texture used in this example\linebreak}
+{Luminosity texture used in this example}
 {material-luminosity-texture-example}
 {H}
 
@@ -488,13 +488,13 @@ \subsection{Reflectance}\label{materials-reflectance}
 {Enabled Fresnel's equations for reflectance. Index of refraction = 6.0}
 {material-fresnel-index-60}
 
-\emph{Color of reflections} colorizes reflected light
+\emph{Color of reflections} colorizes reflected light.
 
 \simpleImageWithCaptionThirdWidth{img/manual/media/material_reflections_color.png}
 {Different colors of reflections}
 {material-reflections-colors}{H}
 
-To colorize reflections can be used bitmap texture. Bright colors will reflect more light. Black means no reflections. More details about texture mapping are in chapter \ref{materials-textures}.
+Colorize reflections can use a texture map from an image file. Brighter areas of the texture will reflect more light, whereas a black color has no reflection. More details about texture mapping are in chapter \ref{materials-textures}.
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/material_texture_reflectance.png}
@@ -565,7 +565,7 @@ \subsection{Transparency}\label{materials-transparency}
 {Transparency of volume = 0.5}
 {material-transparency-volume-05}
 
-To colorize transparency of surface can be used bitmap texture. Bright colors will pass more light. Black means no transparency. More details about texture mapping are in chapter \ref{materials-textures}.
+Colorize transparency can use a texture map from an image file. Brighter areas of the texture will pass more light, whereas a black color has no transparency. More details about texture mapping are in chapter \ref{materials-textures}.
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/material_texture_transparency.png}
@@ -606,7 +606,7 @@ \subsection{Normal map texture}\label{materials-normal-map-texture}
 {material-used-normal-texture}
 {H}
 
-There are two standards of normal maps. The difference between them is in the direction of the Y component of the normal vector. Visually when the Y component is swapped then the green component of the texture is inverted. To configure which type of texture is used use option \emph{Invert green (Y+ / Y-)}
+There are two standards of normal maps. The difference between them is in the direction of the Y component of the normal vector. Visually when the Y component is swapped then the green component of the texture is inverted. The option \emph{Invert green (Y+ / Y-)} is used to configure the type of texture.
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/normal_map_texture.jpg}
@@ -622,29 +622,29 @@ \subsection{Normal map texture}\label{materials-normal-map-texture}
 \item[Standard]: top left corner - green, bottom right- red
 \item[Inverted]: bottom left corner - green, right top - red
 \end{description}
-If you use inverted texture, then check box  \emph{Invert green (Y+ / Y-)}  should be ticked.
+If you use an inverted texture, then check box  \emph{Invert green (Y+ / Y-)}  should be ticked.
 
-Normal maps can be derived from height maps (bumpmaps). If there is used grayscale texture, have to be ticked option \emph{Normal map texture derived from grayscale bump map}.
+Normal maps can be derived from height maps (bumpmaps). Enable \emph{Normal map texture derived from grayscale bump map} if a grayscale texture is used,
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/material_texture_normal_from_greyscale.png}
 {Example use of greyscale bump map as a normal map}
 {material-texture-normal-grayscale}
 {img/manual/media/displacement_texture.jpg}
-{Bump map used in this example\linebreak}
+{Bump map used in this example}
 {material-texture-bumpmap}
 {H}
 
 \subsection{Displacement map texture}\label{materials-texture-displacement}
 
-Displacement map technique uses texture to cause an effect where the actual geometric position of points over the textured surface are displaced. It gives the surfaces a greater sense of depth and detail, permitting self-shadowing. In contrast to normal mapping, it deforms object surface.
-Displacement map textures looks the same as bump maps. Brighter pixels will give stronger embossing of surface.
+Displacement map technique uses texture to cause an effect where the actual geometric position of points over the textured surface are displaced. It gives the surfaces a greater sense of depth and detail, and allows self-shadowing. In contrast to normal mapping, it deforms the object surface.
+Displacement map textures looks the same as bump maps. Brighter pixels will give stronger embossing of the surface.
 
 It is recommended to use 16-bit greyscale textures to get smooth displacements.
 
-Parameter \emph{Height of displacement} controls how much shapes will be deformed.
+Parameter \emph{Height of displacement} controls how much the surface will be deformed.
 
-\textbf{Note:} displacement maps don't work with cubic mapping of textures.
+\textbf{Note:} displacement maps do not work with cubic mapping of textures.
 
 \twoImagesWithTwoCaptionsFullWidth
 {img/manual/media/material_texture_displacement.png}