diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 00d7a93..a71f422 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -934,7 +934,7 @@ Many more specific rules aim at the overall goals of simplicity and elimination
 ##### Reason
 
 It is easier to reason about constants than about variables.
-Sumething immutable cannot change unexpectedly.
+Something immutable cannot change unexpectedly.
 Sometimes immutability enables better optimization.
 You can't have a data race on a constant.