diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index 6786109..12abf1e 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -892,7 +892,7 @@
 main thread where it has possession of the global interpreter lock and can
 perform any Python API calls.
 
-.. cfunction:: void Py_AddPendingCall( int (*func)(void *, void *arg) )
+.. cfunction:: void Py_AddPendingCall(int (*func)(void *), void *arg)
 
    .. index:: single: Py_AddPendingCall()