diff --git a/src/libraries/monads/composition.mli b/src/libraries/monads/composition.mli
index 65ff12e118ed71430017c2201e987c83d1f29928..a45665a64b249c4f10bb22b5a0ed1c213b1178dd 100644
--- a/src/libraries/monads/composition.mli
+++ b/src/libraries/monads/composition.mli
@@ -24,7 +24,7 @@
     "interior monad" and a monad N called the "exterior monad", build
     a monad of type ['a M.t N.t]. To be able to do so, one has to provide
     a [swap] function that, simply put, swap the exterior monad out of
-    the interior one. In other word, this function allows to fix
+    the interior one. In other word, this function allows fixing
     "badly ordered" monads compositions, in the sens that they are
     applied in the opposite order as the desired one.