X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=INSTALL;h=8054fafa1d34a05637323058e316b035bcd7fdff;hp=7479a4b67a71c6b2bd66ea8ae16d866550ba33fb;hb=2786aa4d548d28579c761e9358d44c84dfb29068;hpb=3df2281746d57abbb45790ecb432ef40533c30bc

diff --git a/INSTALL b/INSTALL
index 7479a4b6..8054fafa 100644
--- a/INSTALL
+++ b/INSTALL
@@ -41,6 +41,15 @@ Talloc, and zlib which are each described below:
 
 	GMime is available from https://github.com/jstedfast/gmime
 
+        Sfsexp
+        ------
+
+        sfsexp is the "small fast s-expression" library. Notmuch
+        optionally use it to provide a second query parser.
+
+        sfsexp is available from https://github.com/mjsottile/sfsexp.
+        In Debian Bookworm and later, install libsexp-dev.
+
 	Talloc
 	------
 	Talloc is a memory-pool allocator used by Notmuch.