3 files changed, 8 insertions, 5 deletions

diff --git a/firmware/export/lcd-remote.h b/firmware/export/lcd-remote.h
index bc26a23cb7..1819a4de72 100644
--- a/firmware/export/lcd-remote.h
+++ b/firmware/export/lcd-remote.h
@@ -176,8 +176,8 @@ extern void lcd_remote_clear_viewport(void);
 extern void lcd_remote_puts(int x, int y, const unsigned char *str);
 extern void lcd_remote_putsf(int x, int y, const unsigned char *fmt, ...);
 extern void lcd_remote_putc(int x, int y, unsigned short ch);
-extern void lcd_remote_puts_scroll(int x, int y, const unsigned char *str);
-extern void lcd_remote_putsxy_scroll_func(int x, int y, const unsigned char *string,
+extern bool lcd_remote_puts_scroll(int x, int y, const unsigned char *str);
+extern bool lcd_remote_putsxy_scroll_func(int x, int y, const unsigned char *string,
                                           void (*scroll_func)(struct scrollinfo *),
                                           void *data, int x_offset);
 
diff --git a/firmware/export/lcd.h b/firmware/export/lcd.h
index 87476d9dda..386ac5a8bf 100644
--- a/firmware/export/lcd.h
+++ b/firmware/export/lcd.h
@@ -179,8 +179,8 @@ extern void lcd_putsxy_style_offset(int x, int y, const unsigned char *str,
 extern void lcd_puts(int x, int y, const unsigned char *string);
 extern void lcd_putsf(int x, int y, const unsigned char *fmt, ...);
 extern void lcd_putc(int x, int y, unsigned long ucs);
-extern void lcd_puts_scroll(int x, int y, const unsigned char* string);
-extern void lcd_putsxy_scroll_func(int x, int y, const unsigned char *string,
+extern bool lcd_puts_scroll(int x, int y, const unsigned char* string);
+extern bool lcd_putsxy_scroll_func(int x, int y, const unsigned char *string,
                                    void (*scroll_func)(struct scrollinfo *),
                                    void *data, int x_offset);
 
diff --git a/firmware/export/scroll_engine.h b/firmware/export/scroll_engine.h
index 64e1d6d6ae..ce230a218c 100644
--- a/firmware/export/scroll_engine.h
+++ b/firmware/export/scroll_engine.h
@@ -79,7 +79,10 @@ struct scrollinfo
     bool bidir;
     long start_tick;
 
-    /* support for custom scrolling functions */
+    /* support for custom scrolling functions,
+     * must be called with ::line == NULL to indicate that the line
+     * stops scrolling or when the userdata pointer is going to be changed
+     * (the custom scroller can release the userdata then) */
     void (*scroll_func)(struct scrollinfo *s);
     void *userdata;
 };