diff --git a/text.cabal b/text.cabal
index 7416ca933a55ea5a8e8df96b42c4537e1195e041..ffb92cf805bcecb421d9fcfcbd5ca2a46081b26b 100644
--- a/text.cabal
+++ b/text.cabal
@@ -71,6 +71,8 @@ flag developer
 
 flag integer-pure
   description: Use the pure-Haskell integer library instead of GMP
+  default: False
+  manual: True
 
 library
   c-sources:    cbits/cbits.c