diff --git a/src/Mod/Sketcher/Gui/Resources/icons/small/Constraint_PointOnPoint_sm.xpm b/src/Mod/Sketcher/Gui/Resources/icons/small/Constraint_PointOnPoint_sm.xpm
index fa6eceff91..7f83b834d8 100644
--- a/src/Mod/Sketcher/Gui/Resources/icons/small/Constraint_PointOnPoint_sm.xpm
+++ b/src/Mod/Sketcher/Gui/Resources/icons/small/Constraint_PointOnPoint_sm.xpm
@@ -1,26 +1,25 @@
 /* XPM */
-static char * Constraint_PointOnPoint_sm_xpm[] = {
-"16 16 7 1",
-" 	c None",
-".	c #991515",
-"+	c #E11D1D",
-"@	c #9A1414",
-"#	c #E21D1D",
-"$	c #CC0000",
-"%	c #9B1414",
+static char *Constraint_PointOnPoint_sm_xpm[] = {
+/* columns rows colors chars-per-pixel */
+"16 16 3 1 ",
+"  c None",
+". c #D71414",
+"+ c #AA1919",
+/* pixels */
 "                ",
-"                ",
-"                ",
-"                ",
-"                ",
-"                ",
-"      .++@      ",
-"      #$$#      ",
-"      #$$#      ",
-"      @++%      ",
-"                ",
-"                ",
-"                ",
-"                ",
-"                ",
-"                "};
+"  +          +  ",
+" +.+        +.+ ",
+"  +.+      +.+  ",
+"   +        +   ",
+"      ++++      ",
+"     +....+     ",
+"     +...++     ",
+"     +..+++     ",
+"     +.++.+     ",
+"      ++++      ",
+"   +        +   ",
+"  +.+      +.+  ",
+" +.+        +.+ ",
+"  +          +  ",
+"                "
+};
diff --git a/src/Mod/Sketcher/Gui/Resources/icons/small/README.md b/src/Mod/Sketcher/Gui/Resources/icons/small/README.md
index a28ecb977e..11b295e1c6 100644
--- a/src/Mod/Sketcher/Gui/Resources/icons/small/README.md
+++ b/src/Mod/Sketcher/Gui/Resources/icons/small/README.md
@@ -1,24 +1,47 @@
 To create an XPM file from an SVG file, you need the ImageMagick libraries.
 Then run
 ```
-convert file.svg -geometry 16x16 -colors 16 file_sm.xpm
+convert file.svg -geometry 16x16 -colors 8 file_sm.xpm
 ```
 
-The XPM icon is very small, 16x16 px in size, and you usually don't need
-more than 16 colors.
+The XPM icon is very small, 16x16 px in size, and we usually don't need
+more than 8 colors.
 
 Edit the xpm file manually to do small retouches, for example, setting up
 the transparency and reducing the number of colors exactly to the desired ones.
 
+An XPM image has a header that defines the number of columns, number of rows,
+number of colors, and number of characters per pixel.
+The first rows have the colors definition, so they must match the number
+of colors, while the rest corresponds to the actual bitmap image.
+
 The space character (empty) can be set to the color `None`,
 to indicate transparency.
 
 ```
 /* XPM */
-static char * file_sm_xpm[] = {
-"16 16 7 1",
-"     c None",
-".    c #BB1616",
-"+    c #DE1515",
-"@    c #BE1616",
+static char *file_sm_xpm[] = {
+/* columns rows colors chars-per-pixel */
+"16 16 3 1 ",
+"  c None",
+". c #D71414",
+"+ c #AA1919",
+/* pixels */
+"                ",
+"  +          +  ",
+" +.+        +.+ ",
+"  +.+      +.+  ",
+"   +        +   ",
+"      ++++      ",
+"     +....+     ",
+"     +...++     ",
+"     +..+++     ",
+"     +.++.+     ",
+"      ++++      ",
+"   +        +   ",
+"  +.+      +.+  ",
+" +.+        +.+ ",
+"  +          +  ",
+"                "
+};
 ```