diff --git a/doc/scsh-release-0.5 b/doc/scsh-release-0.5
index 114fcbd..0415145 100644
--- a/doc/scsh-release-0.5
+++ b/doc/scsh-release-0.5
@@ -81,6 +81,13 @@ compilation is now provided, and the AWK macro has been rewritten to
 pre-compile regexps used in rules outside the loop.  It is still, however,
 slower than it should be.
 
+We have introduced two new procedures for our Perl fans, for performing
+regexp-directed string substitutions:
+    regexp-substitute
+    regexp-substitute/global
+The design is not what you might expect, but they are quite powerful
+and efficient.
+
 Execing programs should be faster in this release, since we now use the
 CLOEXEC status bit to get automatic closing of unrevealed port file
 descriptors.