diff --git a/src/intercept.h b/src/intercept.h
index a8145723..67130dfc 100644
--- a/src/intercept.h
+++ b/src/intercept.h
@@ -117,6 +117,15 @@ struct patch_desc {
 
 void patch_apply(struct patch_desc *patch);
 
+/*
+ * A section_list struct contains information about sections where
+ * libsyscall_intercept looks for jump destinations among symbol addresses.
+ * Generally, only two sections are used for this, so 16 should be enough
+ * for the maximum number of headers to be stored.
+ *
+ * See the calls to the add_table_info routine in the intercept_desc.c source
+ * file.
+ */
 struct section_list {
 	Elf64_Half count;
 	Elf64_Shdr headers[0x10];
diff --git a/src/intercept_desc.c b/src/intercept_desc.c
index be059ca6..9823ca6d 100644
--- a/src/intercept_desc.c
+++ b/src/intercept_desc.c
@@ -81,6 +81,8 @@ add_table_info(struct section_list *list, const Elf64_Shdr *header)
 	if (list->count < max) {
 		list->headers[list->count] = *header;
 		list->count++;
+	} else {
+		xabort("allocated section_list exhausted");
 	}
 }