diff --git a/packaging/specifiers.py b/packaging/specifiers.py
index de0f713a..a45dfce3 100644
--- a/packaging/specifiers.py
+++ b/packaging/specifiers.py
@@ -220,7 +220,7 @@ def filter(
 
             if self.contains(parsed_version, **kw):
                 # If our version is a prerelease, and we were not set to allow
-                # prereleases, then we'll store it for later incase nothing
+                # prereleases, then we'll store it for later in case nothing
                 # else matches this specifier.
                 if parsed_version.is_prerelease and not (
                     prereleases or self.prereleases