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-rw-r--r--doc/interface.md5
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/interface.md b/doc/interface.md
index 978ecb3..0882acd 100644
--- a/doc/interface.md
+++ b/doc/interface.md
@@ -115,8 +115,9 @@ floating point number that can be read by the standard library `strtod`
function and stored in a `double` type. this includes arguments like "4.9",
"-1.2e20", "infinity", or "nan".
-arguments acceptable to type `SIMPLE_OPT_CHAR` may be any single-byte
-character.
+arguments acceptable to type `SIMPLE_OPT_CHAR` may be any single-byte character
+or one of the following two-character escape sequences: `\a`, `\b`, `\f`, `\n`,
+`\r`, `\t`, `\v`.
arguments acceptable to type `SIMPLE_OPT_STRING` may be any string of
characters the user passes.