diff --git a/pandas/_libs/src/datetime/pd_datetime.c b/pandas/_libs/src/datetime/pd_datetime.c
index 2c32fb0481486..bf1a0c82e7584 100644
--- a/pandas/_libs/src/datetime/pd_datetime.c
+++ b/pandas/_libs/src/datetime/pd_datetime.c
@@ -192,6 +192,10 @@ static npy_datetime PyDateTimeToEpoch(PyObject *dt, NPY_DATETIMEUNIT base) {
   return npy_dt;
 }
 
+/* Initializes and exposes a customer datetime C-API from the pandas library
+ * by creating a PyCapsule that stores function pointers, which can be accessed
+ * later by other C code or Cython code that imports the capsule.
+ */
 static int pandas_datetime_exec(PyObject *Py_UNUSED(module)) {
   PyDateTime_IMPORT;
   PandasDateTime_CAPI *capi = PyMem_Malloc(sizeof(PandasDateTime_CAPI));