[gmime] Made some docs a bit more clear

[Jeffrey Stedfast <fejj src gnome org>]

commit 6e27f27fb4a520d119f9517078219c9e7a29a716
Author: Jeffrey Stedfast <fejj gnome org>
Date:   Sat Nov 27 22:58:23 2010 -0500

    Made some docs a bit more clear

 gmime/gmime-crypto-context.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gmime/gmime-crypto-context.c b/gmime/gmime-crypto-context.c
index 86106a6..8037973 100644
--- a/gmime/gmime-crypto-context.c
+++ b/gmime/gmime-crypto-context.c
@@ -445,7 +445,9 @@ g_mime_crypto_context_export_keys (GMimeCryptoContext *ctx, GPtrArray *keys,
 /**
  * g_mime_signer_new:
  *
- * Allocates an new #GMimeSigner.
+ * Allocates an new #GMimeSigner. This function is meant to be used in
+ * #GMimeCryptoContext subclasses when allocating signers to add to a
+ * #GMimeSignatureValidity.
  *
  * Returns: a new #GMimeSigner.
  **/