diff --git a/src/doxygen_index.h b/src/doxygen_index.h
index 557be72b3eba96c2fb1d9f434455e417947ffe34..f1d90039b895c2848ebdb5bdcc4658b3ae85d569 100644
--- a/src/doxygen_index.h
+++ b/src/doxygen_index.h
@@ -219,6 +219,7 @@
  * - Libraries for Linux and Windows/MinGW (required by SDL):
  *   - libgl1-mesa-dev | nvidia-glx-dev
  *   - libglu1-mesa-dev
+ *   - libdirectfb-dev
  *   - libxt-dev
  *   - libxext-dev
  *   - libaudio-dev