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diff --git a/README.md b/README.md
index eef582d..2af49a4 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,4 @@ Lessons description:
 - Lesson 7: Handle/Protocol databases internals - Part 2: Raw access to app protocols
 - Lesson 8: `HandleProtocol` API function. Information from the `ImageHandle` protocols
 - Lesson 9: Get ImageHandle protocols with the `ProtocolsPerHandle` API function
+- Lesson 10: `EFI_STATUS` type and `EFI_ERROR` macros