diff --git a/OpenSSL/crypto.py b/OpenSSL/crypto.py
index d642c6c..cab145d 100644
--- a/OpenSSL/crypto.py
+++ b/OpenSSL/crypto.py
@@ -173,7 +173,7 @@
 
     def generate_key(self, type, bits):
         """
-        Generate a key pair of the given type, with the given number of a bits.
+        Generate a key pair of the given type, with the given number of bits.
 
         This generates a key "into" the this object.