diff --git a/book/source/08-signing_components.md b/book/source/08-signing_components.md
index 0d404a5..86318e8 100644
--- a/book/source/08-signing_components.md
+++ b/book/source/08-signing_components.md
@@ -205,7 +205,7 @@ Third-party signatures in OpenPGP primarily encode authentication statements for
 
 ### Certifying identity components
 
-When a signer issues a certifying signature on an identity, it indicates a verified link between the identity and the certificate.That is, the signer vouches for the connection.
+When a signer issues a certifying signature on an identity, it indicates a verified link between the identity and the certificate. That is, the signer vouches for the connection.
 
 For example, Alice can certify Bob's User ID `Bob Baker <bob@example.com>` with his certificate `0xB0B`, by creating a certification signature that binds Bob's User ID and Bob's certificate. Bob then distributes Alice's certifying signature as part of his certificate.