diff --git a/src/msph/README.md b/src/msph/README.md
index 00011ea..3c87d87 100644
--- a/src/msph/README.md
+++ b/src/msph/README.md
@@ -9,6 +9,9 @@ with the SPHO types and subtyping.
 
 Grammar in pseudo-bnf
 
+And yes, it is ambiguous at places. More specification coming when there is
+time.
+
 ```
 
 MSph ::= Body