diff --git a/app/u8glib/README.md b/app/u8glib/README.md
index 07acdf9d..ed5598f8 100644
--- a/app/u8glib/README.md
+++ b/app/u8glib/README.md
@@ -24,5 +24,11 @@ done
 
 rm out/*png out/*xbm
 ```
-
 Convert all the png in the current folder and put resulting .mono to ./out
+
+The convert binary  is a part of ImageMagic package. You need to install it.
+
+```
+sudo apt-get install imagemagick
+```
+for Debian/Ubuntu.
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