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-rw-r--r--docs/source/techspecs/uml_instructions.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/source/techspecs/uml_instructions.rst b/docs/source/techspecs/uml_instructions.rst
index f12fc679b60..0613f941a76 100644
--- a/docs/source/techspecs/uml_instructions.rst
+++ b/docs/source/techspecs/uml_instructions.rst
@@ -616,7 +616,9 @@ Simplification rules
CALLC
~~~~~
-Call a C function with the signature ``void (*)(void *)``.
+Call a C function with the signature ``void (*)(T *)`` or
+``void (*)(T &)`` (i.e. a function with a single pointer or reference
+parameter that does not return a value).
+---------------------------+-----------------------------------------+
| Disassembly | Usage |