diff --git a/gcc/config/riscv/constraints.md b/gcc/config/riscv/constraints.md
index 8c15c6c0486..c87d5b796a5 100644
--- a/gcc/config/riscv/constraints.md
+++ b/gcc/config/riscv/constraints.md
@@ -67,8 +67,7 @@
        (match_test "GET_CODE(XEXP(op,0)) == REG")))
 
 (define_constraint "S"
-  "@internal
-   A constant call address."
+  "A constraint that matches an absolute symbolic address."
   (match_operand 0 "absolute_symbolic_operand"))
 
 (define_constraint "U"
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 0fe70b7ea40..8225a768a5c 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -3536,6 +3536,9 @@ A 5-bit unsigned immediate for CSR access instructions.
 @item A
 An address that is held in a general-purpose register.
 
+@item S
+A constraint that matches an absolute symbolic address.
+
 @end table
 
 @item RX---@file{config/rx/constraints.md}