diff --git a/Doc/library/imaplib.rst b/Doc/library/imaplib.rst
index 0c10e7afee401f..8c28fce99ff912 100644
--- a/Doc/library/imaplib.rst
+++ b/Doc/library/imaplib.rst
@@ -187,7 +187,7 @@ IMAP4 Objects
 -------------
 
 All IMAP4rev1 commands are represented by methods of the same name, either
-upper-case or lower-case.
+uppercase or lowercase.
 
 All arguments to commands are converted to strings, except for ``AUTHENTICATE``,
 and the last argument to ``APPEND`` which is passed as an IMAP4 literal.  If