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-rw-r--r--crawl-ref/source/spl-book.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/crawl-ref/source/spl-book.h b/crawl-ref/source/spl-book.h
index 7e6fe1cdf8..d67023eaeb 100644
--- a/crawl-ref/source/spl-book.h
+++ b/crawl-ref/source/spl-book.h
@@ -49,7 +49,7 @@ int read_book( item_def &item, read_book_action_type action );
* called from: acr
* *********************************************************************** */
bool player_can_memorise(const item_def &book);
-bool learn_spell(void);
+bool learn_spell(int book = -1);
spell_type which_spell_in_book(int sbook_type, int spl);