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-rw-r--r--math/README.libm-test1
1 files changed, 1 insertions, 0 deletions
diff --git a/math/README.libm-test b/math/README.libm-test
index 0271f83f3b..41702c6537 100644
--- a/math/README.libm-test
+++ b/math/README.libm-test
@@ -120,6 +120,7 @@ parameter.
 The accepted parameter types are:
 - "f" for FLOAT
 - "j" for long double.
+- "a" for ARG_FLOAT, the argument type for narrowing functions.
 - "b" for boolean - just tests if the output parameter evaluates to 0
   or 1 (only for output).
 - "c" for complex.  This parameter needs two values, first the real,