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-rw-r--r--docs/source/techspecs/uml_instructions.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/source/techspecs/uml_instructions.rst b/docs/source/techspecs/uml_instructions.rst
index 13d181fcc98..729f7424d5b 100644
--- a/docs/source/techspecs/uml_instructions.rst
+++ b/docs/source/techspecs/uml_instructions.rst
@@ -283,7 +283,8 @@ HASH
Associate a location with the specified mode and emulated program
counter values. The :ref:`HASHJMP <umlinst-hashjmp>` instruction may be
used to transfer control to the location associated with a mode and
-emulated program counter value.
+emulated program counter value. Invariant code blocks may not contain
+HASH instructions.
This is usually used to mark the location of the generated code for an
emulated instruction or sequence of instructions.