diff --git a/docs/manual/contribute.adoc b/docs/manual/contribute.adoc
index 310fe80585..a0002ce188 100644
--- a/docs/manual/contribute.adoc
+++ b/docs/manual/contribute.adoc
@@ -664,7 +664,7 @@ Creating a basic test case involves:
   advantage of using +infra.basetest.BASIC_TOOLCHAIN_CONFIG+ is that a
   matching Linux kernel image is provided, which allows to boot the
   resulting image in Qemu without having to build a Linux kernel image
-  as part of the test case, therefore significant decreasing the build
+  as part of the test case, therefore significantly decreasing the build
   time required for the test case.
 
 * Implementing a +def test_run(self):+ function to implement the