diff --git a/doc/src/manual/strings.md b/doc/src/manual/strings.md
index 2f326260935132..8dd680d0f8cf68 100644
--- a/doc/src/manual/strings.md
+++ b/doc/src/manual/strings.md
@@ -13,7 +13,7 @@ $
 
 The `%c` specifier converts a single character to a decimal string.
 
-ASCII's integer values 0-31 are control characters, 32-126 are for US layout keyboards, and 128-255
+ASCII's integer values 0-31 are control characters, 32-127 are for US layout keyboards, and 128-255
 are "extended" ASCII.
 
 Strings are finite sequences of characters. Other natural languages include RTL character sets and