diff --git a/manual.md b/manual.md
index 35133985f..5b93d0e20 100644
--- a/manual.md
+++ b/manual.md
@@ -180,7 +180,7 @@ GLM is a header-only library, and thus does not need to be compiled. We can use
 #include <glm/glm.hpp>
 ```
 
-To extend the feature set supported by GLM and keeping the library as close to GLSL as possible, new features are implemented as extensions that can be included thought a separated header:
+To extend the feature set supported by GLM and keeping the library as close to GLSL as possible, new features are implemented as extensions that can be included through a separate header:
 
 ```cpp
 // Include all GLM core / GLSL features