Issue #3080: document encoding used by import functions
diff --git a/Include/pycapsule.h b/Include/pycapsule.h
index eba82ee..d9ecda7 100644
--- a/Include/pycapsule.h
+++ b/Include/pycapsule.h
@@ -48,7 +48,9 @@
 
 PyAPI_FUNC(int) PyCapsule_SetContext(PyObject *capsule, void *context);
 
-PyAPI_FUNC(void *) PyCapsule_Import(const char *name, int no_block);
+PyAPI_FUNC(void *) PyCapsule_Import(
+    const char *name,           /* UTF-8 encoded string */
+    int no_block);
 
 
 #ifdef __cplusplus