--- gcc/INSTALL	2018/04/24 18:31:42	1.1.1.9
+++ gcc/INSTALL	2018/04/24 18:36:48	1.1.1.10
@@ -695,6 +695,11 @@ special things you must know:
      GNU systems.  This configuration is being superseded.  You must use
      gas/binutils version 2.5.2 or later.
 
+`i386-*-linuxlibc1'
+     Use this configuration to generate ELF binaries on Linux-based GNU
+     systems using GNU libc version 1 (Linux libc version 5).  You must
+     use gas/binutils version 2.5.2 or later.
+
 `i386-*-linux'
      Use this configuration to generate ELF binaries on Linux-based GNU
      systems.  You must use gas/binutils version 2.5.2 or later.