Added verb ("is") where it was missing

1 files changed, 1 insertions, 1 deletions

diff --git a/c.html.markdown b/c.html.markdown
index 84856b32..99ff0d27 100644
--- a/c.html.markdown
+++ b/c.html.markdown
@@ -92,7 +92,7 @@ int main() {
     printf("%zu\n", sizeof(int)); // => 4 (on most machines with 4-byte words)
 
 
-    // If the argument of the `sizeof` operator an expression, then its argument
+    // If the argument of the `sizeof` operator is an expression, then its argument
     // is not evaluated (except VLAs (see below)).
     // The value it yields in this case is a compile-time constant.
     int a = 1;