diff --git a/scrbl/simple-log.scrbl b/scrbl/simple-log.scrbl
index 8ea1e8a..995f6db 100644
--- a/scrbl/simple-log.scrbl
+++ b/scrbl/simple-log.scrbl
@@ -26,6 +26,7 @@ Defines a logger with topic @racket['id] and creates:
  @item{@racket[warn-id]}
  @item{@racket[err-id]}
  @item{@racket[fatal-id]}
+ @item{@racket[sync-id]}
 ]
 
 Note. If name is given, id @racket[dbg-prefix], etc. will be generated instead of @racket[dbg-id], etc.
@@ -150,5 +151,7 @@ creates:
  (err-my-module [msg string?] [arg any/c] ...) void?]{Error log.}
 @defproc[#:link-target? #f
  (fatal-my-module [msg string?] [arg any/c] ...) void?]{Fatal log.}
+@defproc[#:link-target? #f
+ (sync-my-module) void?]{Puts a sync message to the logger and waits for the receiver until it logs this synchronization event.}
 
-All use @racket[format] and emit asynchronously.
+All, except for @racket[sync-my-module] use @racket[format] and emit asynchronously.