diff --git a/src/conio/cterm.txt b/src/conio/cterm.txt
index 404ccfc7b5cc31a9da5ad6f6ef80792e9dcffae5..cf93943826a16b4db81b2e3de5190a8b0a5aa5ed 100644
--- a/src/conio/cterm.txt
+++ b/src/conio/cterm.txt
@@ -60,6 +60,7 @@ CSI {'0' (ZERO) to '?'}{SPACE to '/'}{'@' to '~'}
 	and {SPACE to '/'} before the terminating {'@' to '~'} character.
 
 	Legal combinations not handled are silently dropped.
+	Illegal combinations are displayed.
 
 Sequence Parameters:
 	Parameters are expressed by the {'0' (ZERO) to '?'} character set.