diff --git a/doc/advanced/content/compiler_optimizations.rst b/doc/advanced/content/compiler_optimizations.rst
index d2d2ddb838b..cd520dcdaa5 100644
--- a/doc/advanced/content/compiler_optimizations.rst
+++ b/doc/advanced/content/compiler_optimizations.rst
@@ -32,3 +32,4 @@ In general there is no good rule of thumb here, but we decided to disable these
 excessive optimizations by default, and rely on CMake's *RelWithDebInfo* by
 default. You should do the same too when you prototype.
 
+# this is a test line for CI.
\ No newline at end of file
diff --git a/test/features/test_base_feature.cpp b/test/features/test_base_feature.cpp
index 426a780308f..c42d56fd662 100644
--- a/test/features/test_base_feature.cpp
+++ b/test/features/test_base_feature.cpp
@@ -178,3 +178,4 @@ main (int argc, char** argv)
   return (RUN_ALL_TESTS ());
 }
 /* ]--- */
+// this is a test line for CI.