1 files changed, 3 insertions, 0 deletions
diff --git a/apl9.h b/apl9.h
index c275d73..7c03918 100644
--- a/apl9.h
+++ b/apl9.h
@@ -264,6 +264,9 @@ void throwerror(Rune *, int);
 		memcpy(globalerror.jmp, old, sizeof(jmp_buf));\
 }
 
+/* inverse.c */
+Function inverse(Function);
+
 /* Monadic functions from function.c */
 Array *fnNegate(Array *);
 Array *fnSign(Array *);