diff --git a/include/kernaux/multiboot2.h b/include/kernaux/multiboot2.h
index 3fbec52..7262cdc 100644
--- a/include/kernaux/multiboot2.h
+++ b/include/kernaux/multiboot2.h
@@ -510,6 +510,62 @@ void KernAux_Multiboot2_ITagBase_print(
     void (*printf)(const char *format, ...)
 );
 
+/*******************************
+ * Header validation functions *
+ *******************************/
+
+bool KernAux_Multiboot2_Header_is_valid(
+    const struct KernAux_Multiboot2_Header *multiboot2_header
+);
+
+bool KernAux_Multiboot2_HTagBase_is_valid(
+    const struct KernAux_Multiboot2_HTagBase *tag_base
+);
+
+bool KernAux_Multiboot2_HTag_None_is_valid(
+    const struct KernAux_Multiboot2_HTag_None *tag
+);
+
+bool KernAux_Multiboot2_HTag_InfoReq_is_valid(
+    const struct KernAux_Multiboot2_HTag_InfoReq *tag
+);
+
+bool KernAux_Multiboot2_HTag_Addr_is_valid(
+    const struct KernAux_Multiboot2_HTag_Addr *tag
+);
+
+bool KernAux_Multiboot2_HTag_EntryAddr_is_valid(
+    const struct KernAux_Multiboot2_HTag_EntryAddr *tag
+);
+
+bool KernAux_Multiboot2_HTag_Flags_is_valid(
+    const struct KernAux_Multiboot2_HTag_Flags *tag
+);
+
+bool KernAux_Multiboot2_HTag_Framebuffer_is_valid(
+    const struct KernAux_Multiboot2_HTag_Framebuffer *tag
+);
+
+bool KernAux_Multiboot2_HTag_ModuleAlign_is_valid(
+    const struct KernAux_Multiboot2_HTag_ModuleAlign *tag
+);
+
+bool KernAux_Multiboot2_HTag_EFIBootServices_is_valid(
+    const struct KernAux_Multiboot2_HTag_EFIBootServices *tag
+);
+
+bool KernAux_Multiboot2_HTag_EFII386EntryAddr_is_valid(
+    const struct KernAux_Multiboot2_HTag_EFII386EntryAddr *tag
+);
+
+bool KernAux_Multiboot2_HTag_EFIAmd64EntryAddr_is_valid(
+    const struct KernAux_Multiboot2_HTag_EFIAmd64EntryAddr *tag
+);
+
+bool KernAux_Multiboot2_HTag_RelocatableHeader_is_valid(
+    const struct KernAux_Multiboot2_HTag_RelocatableHeader *tag
+);
+
 /************************************
  * Information validation functions *
  ************************************/