diff --git a/doc/mmu.7.adoc b/doc/mmu.7.adoc
index 51c8dbb..4c48396 100644
--- a/doc/mmu.7.adoc
+++ b/doc/mmu.7.adoc
@@ -54,7 +54,7 @@ The kernel does no detailed memory management within an environment,
 but it does know its boundaries. To modify the memory size of an environment
 this can be done using *SBRK(2)*
 
-Memory management within the enviroment needs to be done for example with 
+Memory management within the environment needs to be done for example with 
 the *lib6502(7)* memory management. 
 
 === PORTS OVERVIEW