diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 5bd1d29487139..6f2a1b6c9ee3b 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -3914,6 +3914,11 @@ following flags to enable otherwise unsafe floating-point transformations.
    No Signed Zeros - Allow optimizations to treat the sign of a zero
    argument or zero result as insignificant. This does not imply that -0.0
    is poison and/or guaranteed to not exist in the operation.
+   For fcmp, this has no effect. For min/max intrinsics, this allows
+   returning either +0 or -0 if both +0 and -0 are passed.
+   For calls to anything other than a min/max intrinsic,
+   arithmetic instructions, select, and phi, if the result is zero,
+   the returned value can be a zero of either sign.
 
 Note: For :ref:`phi <i_phi>`, :ref:`select <i_select>`, and :ref:`call <i_call>`
 instructions, the following return types are considered to be floating-point