diff --git a/doc/lib.txt b/doc/lib.txt
index 6a8f32e071..868adde89b 100644
--- a/doc/lib.txt
+++ b/doc/lib.txt
@@ -122,7 +122,7 @@ String handling
   This module contains various string matchers for email addresses, etc.
 
 * `subexes <subexes.html>`_
-  This module implements advanted string substitution operations.
+  This module implements advanced string substitution operations.
 
 
 Generic Operating System Services
diff --git a/doc/subexes.txt b/doc/subexes.txt
index f43983e090..54304f0333 100644
--- a/doc/subexes.txt
+++ b/doc/subexes.txt
@@ -1,7 +1,7 @@
 Substitution Expressions (subex)
 ================================
 
-A *subex* (*Substitution Expression*) represents an advanted string
+A *subex* (*Substitution Expression*) represents an advanced string
 substitution. In contrast to a `regex`:idx: which deals with string analysis, a
 *subex* deals with string synthesis.