diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 0d1e808..1d6c75f 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -5,7 +5,7 @@
 # return_type func_name[|alias_list][:syscall_name[:socketcall_id]]([parameter_list]) arch_list
 #
 # where:
-#       arch_list ::= "all" | "custom" | arch+
+#       arch_list ::= "all" | arch+
 #       arch      ::= "arm" | "mips" | "x86" | "x86_64"
 #
 # Note:
@@ -22,9 +22,6 @@
 #
 #      - Each parameter type is assumed to be stored in 32 bits.
 #
-#      - The arch list can be the word "custom" meaning "do not generate any stubs".
-#        In this case, a hand-written custom stub must be provided.
-#
 # This file is processed by a python script named gensyscalls.py.
 
 # process management
@@ -65,7 +62,6 @@
 int     setgid:setgid(gid_t)       mips,x86_64
 int     setuid:setuid32(uid_t)    arm,x86
 int     setuid:setuid(uid_t)      mips,x86_64
-int     seteuid:seteuid32(uid_t)   custom
 int     setreuid:setreuid32(uid_t, uid_t)   arm,x86
 int     setreuid:setreuid(uid_t, uid_t)     mips,x86_64
 int     setresuid:setresuid32(uid_t, uid_t, uid_t)   arm,x86
@@ -87,7 +83,6 @@
 int     getrusage(int who, struct rusage*  r_usage)  all
 int     setgroups:setgroups32(int, const gid_t*)   arm,x86
 int     setgroups:setgroups(int, const gid_t*)     mips,x86_64
-pid_t   getpgrp(void)  custom
 int     setpgid(pid_t, pid_t)  all
 pid_t   vfork(void)  arm,x86_64
 int     setregid:setregid32(gid_t, gid_t)  arm,x86
@@ -110,7 +105,6 @@
 int         __open:open(const char*, int, mode_t)  all
 int         __openat:openat(int, const char*, int, mode_t) all
 int         close(int)                      all
-int         creat(const char*, mode_t)       custom
 off_t       lseek(int, off_t, int)           arm,x86,mips
 off_t       lseek|lseek64(int, off_t, int)   x86_64
 int         __llseek:_llseek(int, unsigned long, unsigned long, off64_t*, int)  arm,x86,mips
@@ -175,7 +169,6 @@
 int     lchown:lchown32(const char*, uid_t, gid_t)  arm,x86
 int     lchown:lchown(const char*, uid_t, gid_t)  mips,x86_64
 int     mount(const char*, const char*, const char*, unsigned long, const void*)  all
-int     umount(const char*)  custom
 int     umount2(const char*, int)  all
 int     fstat:fstat64(int, struct stat*)    arm,x86,mips
 int     fstat(int, struct stat*)    x86_64
diff --git a/libc/tools/bionic_utils.py b/libc/tools/bionic_utils.py
index 0ca2178..f8d8897 100644
--- a/libc/tools/bionic_utils.py
+++ b/libc/tools/bionic_utils.py
@@ -122,9 +122,7 @@
 
         # Parse the architecture list.
         arch_list = line[pos_rparen+1:].strip()
-        if arch_list == "custom":
-            pass
-        elif arch_list == "all":
+        if arch_list == "all":
             for arch in all_arches:
                 t[arch] = True
         else: