diff --git a/doc/generated/README.md b/doc/generated/README.md
index dd8a85e8c..6b2fe1856 100644
--- a/doc/generated/README.md
+++ b/doc/generated/README.md
@@ -30,3 +30,6 @@ output is put into `doc/` directory. The executable requires two textures:
     ```bash
     magnum-distancefieldconverter --importer PngImporter --converter PngImageConverter --output-size "64 64" --radius 16 vector-src.png vector-distancefield.png
     ```
+Apply `pngcrush` to the result for smaller file sizes:
+
+    for f in $(ls shaders-*.png); do pngcrush -ow $f; done
diff --git a/doc/shaders-distancefieldvector.png b/doc/shaders-distancefieldvector.png
index 15044a28d..aa1ce7b94 100644
Binary files a/doc/shaders-distancefieldvector.png and b/doc/shaders-distancefieldvector.png differ
diff --git a/doc/shaders-flat.png b/doc/shaders-flat.png
index bbfe0e66d..ef93e076e 100644
Binary files a/doc/shaders-flat.png and b/doc/shaders-flat.png differ
diff --git a/doc/shaders-meshvisualizer.png b/doc/shaders-meshvisualizer.png
index 1a38dafb0..6d5f981b1 100644
Binary files a/doc/shaders-meshvisualizer.png and b/doc/shaders-meshvisualizer.png differ
diff --git a/doc/shaders-phong.png b/doc/shaders-phong.png
index 185e6d38a..0f7017436 100644
Binary files a/doc/shaders-phong.png and b/doc/shaders-phong.png differ
diff --git a/doc/shaders-vector.png b/doc/shaders-vector.png
index cd8a01f9e..a2a156347 100644
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diff --git a/doc/shaders-vertexcolor.png b/doc/shaders-vertexcolor.png
index 9017d2c50..9a3892309 100644
Binary files a/doc/shaders-vertexcolor.png and b/doc/shaders-vertexcolor.png differ