diff --git a/doc/lispref/strings.texi b/doc/lispref/strings.texi
index cfc14be8ba0..f19dd6dd4d7 100644
--- a/doc/lispref/strings.texi
+++ b/doc/lispref/strings.texi
@@ -1036,6 +1036,7 @@ way.  The object can also be a floating-point number that is formatted
 as an integer, dropping any fraction.
 
 @item %d
+@itemx %i
 Replace the specification with the base-ten representation of a signed
 integer.  The object can also be a floating-point number that is
 formatted as an integer, dropping any fraction.
diff --git a/src/editfns.c b/src/editfns.c
index ea71c3cda37..fc9162b12f9 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -3312,7 +3312,7 @@ The format control string may contain %-sequences meaning to substitute
 the next available argument, or the argument explicitly specified:
 
 %s means produce a string argument.  Actually, produces any object with `princ'.
-%d means produce as signed number in decimal.
+%d or %i means produce a signed number in decimal.
 %o means produce a number in octal.
 %x means produce a number in hex.
 %X is like %x, but uses upper case.
@@ -3324,7 +3324,7 @@ the next available argument, or the argument explicitly specified:
 %c means produce a number as a single character.
 %S means produce any object as an s-expression (using `prin1').
 
-The argument used for %d, %o, %x, %e, %f, %g or %c must be a number.
+The argument used for %d, %i, %o, %x, %e, %f, %g or %c must be a number.
 %o, %x, and %X treat arguments as unsigned if `binary-as-unsigned' is t
   (this is experimental; email 32252@debbugs.gnu.org if you need it).
 Use %% to put a single % into the output.