diff --git a/lib11sht.c b/lib11sht.c
index d7caadc..c41bf8a 100644
--- a/lib11sht.c
+++ b/lib11sht.c
@@ -16,8 +16,7 @@
 
 /* Internal helpers -- kept private to this translation unit. */
 static int   uselesschar(int c);
-/* trim is public (declared in lib11sht.h) */
-static void  asciify(const char *src, char *dest, size_t dest_size);
+/* trim and asciify are public (declared in lib11sht.h) */
 static int   ulen(unsigned char c);
 static float shit11(char *s1, char *s2);
 static float fmin3(float a, float b, float c);
@@ -210,7 +209,7 @@ static int ulen(unsigned char c)
 }
 
 /* ---------------------------------------------------------------------- */
-static void asciify(const char *src, char *dest, size_t dest_size)
+void asciify(const char *src, char *dest, size_t dest_size)
 {
     int len, i, k, j, found;
     char ch[5]; /* UTF8 multibyte char */
diff --git a/lib11sht.h b/lib11sht.h
index 16afe90..1203b6b 100644
--- a/lib11sht.h
+++ b/lib11sht.h
@@ -92,4 +92,18 @@ int fequal(float a, float b, float delta);
  * be NUL-terminated. */
 void trim(char *s);
 
+/* Transliterate accented Latin chars to plain ASCII. Walks src as UTF-8,
+ * mapping known accented chars (a-acute, c-cedilla, n-tilde, NBSP, ...)
+ * to their ASCII equivalents and copying ASCII bytes verbatim. Output is
+ * always pure ASCII and NUL-terminated. Bytes that don't match the
+ * transliteration table are skipped.
+ *
+ * Parameters:
+ *   src        input UTF-8 string (NUL-terminated)
+ *   dest       output buffer (filled with NUL-terminated ASCII)
+ *   dest_size  size of dest in bytes (writes capped at dest_size-1 + final NUL)
+ *
+ * Safe for NULL / zero-size args (no-op). */
+void asciify(const char *src, char *dest, size_t dest_size);
+
 #endif /* LIB11SHT_H */