diff --git a/nettle.texinfo b/nettle.texinfo
index 603f8349fcd5b21f5779aa597b7fbdda6039ce59..5f2d95ed8b89a3243a2fb613bc376de9450bb3d0 100644
--- a/nettle.texinfo
+++ b/nettle.texinfo
@@ -510,7 +510,7 @@ The functions are analogous to the MD5 ones.
 @end deftp
 
 @defvr Constant SHA256_DIGEST_SIZE
-The size of an SHA256 digest, i.e. 20.
+The size of an SHA256 digest, i.e. 32.
 @end defvr
 
 @defvr Constant SHA256_DATA_SIZE