diff --git a/requirement-build.txt b/requirement-build.txt
index da96f52..1ea522f 100644
--- a/requirement-build.txt
+++ b/requirement-build.txt
@@ -2,6 +2,9 @@
 #   DR basic running from source
 #   DR build (by nuitka)
 
+# for function
+lib-not-dr
+
 # for images
 # not for pypy >= 3.10
 pillow >= 10.0.0; (platform_python_implementation == "PyPy" and python_version < "3.10") or platform_python_implementation == "CPython"
diff --git a/requirement-dev.txt b/requirement-dev.txt
index eb58a12..7a67eff 100644
--- a/requirement-dev.txt
+++ b/requirement-dev.txt
@@ -3,6 +3,9 @@
 #   DR build (by nuitka)
 #   DR contributing
 
+# for function
+lib-not-dr
+
 # for images
 # not for pypy >= 3.10
 pillow >= 10.0.0; (platform_python_implementation == "PyPy" and python_version < "3.10") or platform_python_implementation == "CPython"
diff --git a/requirement.txt b/requirement.txt
index 316f5a8..e61d40e 100644
--- a/requirement.txt
+++ b/requirement.txt
@@ -1,6 +1,9 @@
 # this requirement is for
 #   DR basic running from source
 
+# for function
+lib-not-dr
+
 # for images
 # not for pypy >= 3.10
 pillow >= 10.0.0; (platform_python_implementation == "PyPy" and python_version < "3.10") or platform_python_implementation == "CPython"