diff --git a/typed-racket-doc/typed-racket/scribblings/reference/types.scrbl b/typed-racket-doc/typed-racket/scribblings/reference/types.scrbl
index 2a3896e8..e5243921 100644
--- a/typed-racket-doc/typed-racket/scribblings/reference/types.scrbl
+++ b/typed-racket-doc/typed-racket/scribblings/reference/types.scrbl
@@ -261,6 +261,7 @@ These are not part of the numeric tower.
 @defidform[Place]
 @defidform[Place-Channel]
 @defidform[Semaphore]
+@defidform[FSemaphore]
 @defidform[Will-Executor]
 @defidform[Pseudo-Random-Generator]
 )]{
diff --git a/typed-racket-lib/typed-racket/base-env/base-env.rkt b/typed-racket-lib/typed-racket/base-env/base-env.rkt
index f8de6bd8..be1082b7 100644
--- a/typed-racket-lib/typed-racket/base-env/base-env.rkt
+++ b/typed-racket-lib/typed-racket/base-env/base-env.rkt
@@ -1436,6 +1436,14 @@
 [would-be-future (-poly (A) ((-> A) . -> . (-future A)))]
 [processor-count (-> -PosInt)]
 
+;; Section 11.4.2 (Future Semaphores)
+[make-fsemaphore (-> -Nat -FSemaphore)]
+[fsemaphore? (make-pred-ty -FSemaphore)]
+[fsemaphore-post (-> -FSemaphore -Void)]
+[fsemaphore-wait (-> -FSemaphore -Void)]
+[fsemaphore-try-wait? (-> -FSemaphore B)]
+[fsemaphore-count (-> -FSemaphore -Nat)]
+
 ;; Section 11.5 (Places)
 [place-enabled? (-> -Boolean)]
 [place? (make-pred-ty -Place)]
diff --git a/typed-racket-lib/typed-racket/base-env/base-types.rkt b/typed-racket-lib/typed-racket/base-env/base-types.rkt
index ff389c9a..1f02b2c6 100644
--- a/typed-racket-lib/typed-racket/base-env/base-types.rkt
+++ b/typed-racket-lib/typed-racket/base-env/base-types.rkt
@@ -149,6 +149,7 @@
 [Thread-Group -Thread-Group]
 [Impersonator-Property -Impersonator-Property]
 [Semaphore -Semaphore]
+[FSemaphore -FSemaphore]
 [Bytes-Converter -Bytes-Converter]
 [Pseudo-Random-Generator -Pseudo-Random-Generator]
 [Logger -Logger]
diff --git a/typed-racket-lib/typed-racket/types/abbrev.rkt b/typed-racket-lib/typed-racket/types/abbrev.rkt
index 87fd3bb8..f50eb07c 100644
--- a/typed-racket-lib/typed-racket/types/abbrev.rkt
+++ b/typed-racket-lib/typed-racket/types/abbrev.rkt
@@ -32,6 +32,7 @@
            (only-in racket/flonum flvector?)
            (only-in racket/extflonum extflvector?)
            (only-in racket/fixnum fxvector?)
+           (only-in racket/future fsemaphore?)
            (only-in '#%place place? place-channel?))
          (only-in racket/pretty pretty-print-style-table?)
          (only-in racket/udp udp?)
@@ -39,6 +40,7 @@
          (only-in racket/flonum flvector?)
          (only-in racket/extflonum extflvector?)
          (only-in racket/fixnum fxvector?)
+         (only-in racket/future fsemaphore?)
          (only-in '#%place place? place-channel?))
 
 (provide (except-out (all-defined-out) make-Base)
@@ -222,6 +224,7 @@
 (define/decl -Impersonator-Property
   (make-Base 'Impersonator-Property #'impersonator-property? impersonator-property?))
 (define/decl -Semaphore (make-Base 'Semaphore #'semaphore? semaphore?))
+(define/decl -FSemaphore (make-Base 'FSemaphore #'fsemaphore? fsemaphore?))
 (define/decl -Bytes-Converter (make-Base 'Bytes-Converter #'bytes-converter? bytes-converter?))
 (define/decl -Pseudo-Random-Generator
   (make-Base 'Pseudo-Random-Generator #'pseudo-random-generator? pseudo-random-generator?))
diff --git a/typed-racket-test/unit-tests/typecheck-tests.rkt b/typed-racket-test/unit-tests/typecheck-tests.rkt
index 2ad9ba71..497cd8a2 100644
--- a/typed-racket-test/unit-tests/typecheck-tests.rkt
+++ b/typed-racket-test/unit-tests/typecheck-tests.rkt
@@ -1855,6 +1855,13 @@
                                      'not-a-failure-thunk
                                      "x")]
 
+        ;; Future Semaphores
+        [tc-e (make-fsemaphore 5) -FSemaphore]
+        [tc-e (fsemaphore-count (make-fsemaphore 5)) -Nat]
+        [tc-e (let: ((s : FSemaphore (make-fsemaphore 3)))
+                      (fsemaphore-post s))
+              -Void]
+
         ;Random Numbers
         (tc-e (make-pseudo-random-generator) -Pseudo-Random-Generator)
         (tc-e (let: ((pg : Pseudo-Random-Generator (make-pseudo-random-generator)))