diff --git a/doc/advanced/content/c_cache.rst b/doc/advanced/content/c_cache.rst
index 8d2826cce37..9553bac1ee7 100644
--- a/doc/advanced/content/c_cache.rst
+++ b/doc/advanced/content/c_cache.rst
@@ -85,3 +85,4 @@ depending on where you stored the ``colorgcc`` softlinks, so that when
 cc/gcc/g++/c++ is invoked the freshly created softlinks get activated first and
 not the global /usr/bin/{cc,gcc,g++,c++}.
 
+# this is a test line for CI.
\ No newline at end of file