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diff --git a/util/README.txt b/util/README.txt
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@@ -4,3 +4,16 @@ Utility programs used to build the FLTK library.
Contents:
cmap.cxx generate src/fl_cmap.h
+ code_snapshot.cxx PDF documentation tool to generate a png image from a
+ Doxygen `@code` segment with international characters
+
+Build System:
+
+ The util directory includes CMake support. Utilities are built
+ automatically during the build process when needed. Some utilities
+ are only built when specific features are enabled:
+
+ - the PDF documentation helper is only built when FLTK_BUILD_PDF_DOCS=ON
+
+ To add a new utility, edit util/CMakeLists.txt and follow the existing
+ patterns for conditional building and target configuration.