diff --git a/ice-9/boot-9.scm b/ice-9/boot-9.scm
index 4df582807..e854f6db7 100644
--- a/ice-9/boot-9.scm
+++ b/ice-9/boot-9.scm
@@ -3183,7 +3183,7 @@
 ;;;
 ;;; Currently, the following feature identifiers are supported:
 ;;;
-;;;   guile r5rs srfi-0 srfi-6
+;;;   guile r5rs srfi-0 srfi-6 srfi-13 srfi-14
 ;;;
 ;;; Remember to update the features list when adding more SRFIs.
 ;;;
@@ -3194,6 +3194,8 @@
     r5rs
     srfi-0   ;; cond-expand itself
     srfi-6   ;; open-input-string etc, in the guile core
+    srfi-13  ;; string library
+    srfi-14  ;; character sets
     ))
 
 ;; This table maps module public interfaces to the list of features.