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diff --git a/common.h b/common.h
index 2b6d695..9b9b0e6 100644
--- a/common.h
+++ b/common.h
@@ -569,6 +569,8 @@ typedef struct {
     char * polyglotDir;
     Boolean usePolyglotBook;
     char * polyglotBook;
+    int bookDepth;
+    int bookStrength;
     int defaultHashSize;
     int defaultCacheSizeEGTB;
     char * defaultPathEGTB;