diff --git a/Changelog.md b/Changelog.md
index bc79b88af1a2..c671e22f2c96 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,8 @@
+### 0.5.0 (unreleased)
+
+Breaking Changes:
+ * New reserved word: ``assert``
+
 ### 0.4.3 (unreleased)
 
 Features:
diff --git a/libsolidity/parsing/Token.h b/libsolidity/parsing/Token.h
index 5dd4299270b6..0f03a420db3e 100644
--- a/libsolidity/parsing/Token.h
+++ b/libsolidity/parsing/Token.h
@@ -221,6 +221,7 @@ namespace solidity
 	/* Keywords reserved for future use. */                            \
 	K(Abstract, "abstract", 0)                                         \
 	K(After, "after", 0)                                               \
+	K(Assert, "assert", 0)                                             \
 	K(Case, "case", 0)                                                 \
 	K(Catch, "catch", 0)                                               \
 	K(Final, "final", 0)                                               \