diff --git a/src/Core/Settings.h b/src/Core/Settings.h
index 86e04b2ab4e..3349662cb78 100644
--- a/src/Core/Settings.h
+++ b/src/Core/Settings.h
@@ -186,7 +186,7 @@ class IColumn;
     M(Bool, allow_suspicious_ttl_expressions, false, "Reject TTL expressions that don't depend on any of table's columns. It indicates a user error most of the time.", 0) \
     M(Bool, allow_suspicious_variant_types, false, "In CREATE TABLE statement allows specifying Variant type with similar variant types (for example, with different numeric or date types). Enabling this setting may introduce some ambiguity when working with values with similar types.", 0) \
     M(Bool, allow_suspicious_primary_key, false, "Forbid suspicious PRIMARY KEY/ORDER BY for MergeTree (i.e. SimpleAggregateFunction)", 0) \
-    M(Bool, compile_expressions, false, "Compile some scalar functions and operators to native code.", 0) \
+    M(Bool, compile_expressions, false, "Compile some scalar functions and operators to native code. Due to a bug in the LLVM compiler infrastructure, on AArch64 machines, it is known to lead to a nullptr dereference and, consequently, server crash. Do not enable this setting.", 0) \
     M(UInt64, min_count_to_compile_expression, 3, "The number of identical expressions before they are JIT-compiled", 0) \
     M(Bool, compile_aggregate_expressions, true, "Compile aggregate functions to native code.", 0) \
     M(UInt64, min_count_to_compile_aggregate_expression, 3, "The number of identical aggregate expressions before they are JIT-compiled", 0) \