diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index dcc9f56..1ea351f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -232,7 +232,7 @@ During review, the following matters should be checked:
 
 - Stable ABI or API additions must be justified by actual use cases, not only
 by speculation. They must also be documented, and it is strongly recommended to
-include tests excercising the additions in the test suite.
+include tests exercising the additions in the test suite.
 
 - The code fits the existing software architecture, e.g. no layering
 violations.