diff --git a/packer/src/sarasacw_omrf_packer/templates/XXX.pc.jinja b/packer/src/sarasacw_omrf_packer/templates/XXX.pc.jinja
index b733985..0386abd 100644
--- a/packer/src/sarasacw_omrf_packer/templates/XXX.pc.jinja
+++ b/packer/src/sarasacw_omrf_packer/templates/XXX.pc.jinja
@@ -1,3 +1,5 @@
+# This file is created by sarasacw-omrf-packer and should not be changed manually.
+
 {#
 Utilize ${pcfiledir} to fetch the directory where current .pc file is.
 And back to parent twice to obtain the installation directory.
diff --git a/packer/src/sarasacw_omrf_packer/templates/XXXConfig.cmake.jinja b/packer/src/sarasacw_omrf_packer/templates/XXXConfig.cmake.jinja
index 6fba128..fad4bc9 100644
--- a/packer/src/sarasacw_omrf_packer/templates/XXXConfig.cmake.jinja
+++ b/packer/src/sarasacw_omrf_packer/templates/XXXConfig.cmake.jinja
@@ -1,3 +1,5 @@
+# This file is created by sarasacw-omrf-packer and should not be changed manually.
+
 {# Check whether this target is already exported -#}
 if(TARGET {{ namespace }}::{{ target }})
   message(STATUS "Target {{ namespace }}::{{ target }} is already defined.")