diff --git a/src/TechTree.cpp b/src/TechTree.cpp
index f9b5aba5d39fd7447b18bb41992d37b683f10787..eb94cc0fa7659edf4e08e9c1f861b7d924d731dc 100644
--- a/src/TechTree.cpp
+++ b/src/TechTree.cpp
@@ -48,7 +48,7 @@ void TechTree::onStart()
             data.requiredUnits.clear();
             data.requiredUpgrades.clear();
             updated.insert(description.result_type);
-			data.buildTime = description.buildTime;
+			data.buildTime = description.buildTime; // The time in seconds it takes to create the unit
 
             data.buildAbility = sc2::ABILITY_ID::INVALID;
         }
diff --git a/src/TechTreeImproved.cpp b/src/TechTreeImproved.cpp
index a6594be4f9f858d908feca9d2b8644ed9ebc5bc4..eab4ff200f0af3ee615c2e136c33270e9b2c9b99 100644
--- a/src/TechTreeImproved.cpp
+++ b/src/TechTreeImproved.cpp
@@ -116,7 +116,7 @@ void parse_build_description(BuildDescription & description, json & build_item)
 {
     description.result_type = static_cast<sc2::UNIT_TYPEID>(build_item["unit"]);
     description.build_ability = static_cast<sc2::ABILITY_ID>(build_item["ability"]);
-	description.buildTime = static_cast<int>(build_item["time"]);
+	description.buildTime = static_cast<int>(build_item["time"]); // The time in seconds it takes to create the unit parsed from the json file
 
     if (build_item.find("requires") != build_item.end())
     {
diff --git a/src/TechTreeImproved.h b/src/TechTreeImproved.h
index 4dd5a253b8e1f04e203aad20e6037afee5ce08eb..d5134a532acd98cc36968d39eaf698aac51d1dba 100644
--- a/src/TechTreeImproved.h
+++ b/src/TechTreeImproved.h
@@ -18,7 +18,7 @@ struct BuildDescription
     std::vector<sc2::UNIT_TYPEID> buildings_needed;
     std::vector<sc2::UNIT_TYPEID> addons_needed;
     std::vector<sc2::UPGRADE_ID> upgrades_needed;
-	int buildTime;
+	int buildTime; // The time in seconds it takes to create the unit
 };
 
 struct ResearchDescription