diff --git a/gui/projectfile.txt b/gui/projectfile.txt
index 2724e1eba..eed96379b 100644
--- a/gui/projectfile.txt
+++ b/gui/projectfile.txt
@@ -27,6 +27,9 @@ program. The format is:
+
+
+
where:
@@ -42,5 +45,7 @@ where:
recommended that relative paths are used for paths inside the project root
folder for better portability.
- defines element contains a list of C/C++ preprocessor defines.
+- ignore element contains list of paths to ignore. The path can be a
+ directory (must end with path separator) or file.
See also gui.cppcheck file in gui-directory of cppcheck sources.