diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -4093,9 +4093,12 @@
     The two strings '``true``' and '``false``' are both valid constants
     of the ``i1`` type.
 **Integer constants**
-    Standard integers (such as '4') are constants of the
-    :ref:`integer <t_integer>` type. Negative numbers may be used with
-    integer types.
+    Standard integers (such as '4') are constants of the :ref:`integer
+    <t_integer>` type. They can be either decimal or
+    hexadecimal. Decimal integers can be prefixed with - to represent
+    negative integers, whilst hexadecimal integers must be prefixed
+    with either u or s to indicate whether they are unsigned or signed
+    respectively, e.g u0x1234.
 **Floating-point constants**
     Floating-point constants use standard decimal notation (e.g.
     123.421), exponential notation (e.g. 1.23421e+2), or a more precise