diff --git a/README.md b/README.md
index 7f136f0..0e7ca89 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,9 @@ $ cmake --build .build-ccov -- ccov
 
 browse to `.build-ccov/ccov/html/index.html`
 
+Running `cmake --install` for a coverage build will install coverage report (if generated)
+to `${CMAKE_INSTALL_PREFIX}/share/doc/xo_flatstring`
+
 ### LSP support
 ```
 $ cd xo-flatstring
diff --git a/utest/CMakeLists.txt b/utest/CMakeLists.txt
index 142a1a4..091e56e 100644
--- a/utest/CMakeLists.txt
+++ b/utest/CMakeLists.txt
@@ -17,6 +17,9 @@ add_test(NAME ${SELF_EXE} COMMAND ${SELF_EXE})
 set(CCOV_OUTPUT_DIR ${PROJECT_BINARY_DIR}/ccov/html)
 set(CCOV_INDEX_FILE ${CCOV_OUTPUT_DIR}/index.html)
 set(CCOV_REPORT_EXE ${PROJECT_BINARY_DIR}/gen-ccov)
+# CMAKE_INSTALL_DOCDIR
+#  =default=> DATAROOTDIR/doc/PROJECT_NAME
+#  =default=> CMAKE_INSTALL_PREFIX/share/doc/xo_flatstring
 set(CCOV_INSTALL_DOCDIR ${CMAKE_INSTALL_DOCDIR}/ccov)
 
 # 'test' target should always be out-of-date